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Archaic Legal Glossary & Citations

“Letters Patent”14th–20th Century
19th-C Meaning:

Open public letters from a monarch or government (literae patentes) granting monopoly rights.

Modern Engineering Decoded:Issued USPTO utility or design patent publication.
Historical note: Contrasted with 'letters close' (private sealed royal correspondence).
“In testimony whereof”19th Century
19th-C Meaning:

Formal concluding legal formula affirming under oath the execution of the instrument.

Modern Engineering Decoded:Inventor and witness digital/physical signatures.
Historical note: Required two witness attestations in 19th-century USPTO filing procedure.
“Aeroplane”Early 20th Century (Wright era)
19th-C Meaning:

A flat or cambered lifting aerofoil surface supported dynamically by air pressure.

Modern Engineering Decoded:Wing / Airfoil lifting surface (later evolved to mean the entire motorized aircraft).
Historical note: The Wrights used 'aeroplane' to denote the individual fabric-covered wings.
“Undulating Current”19th Century (Bell era)
19th-C Meaning:

An electric current whose magnitude varies continuously and periodically without interruption.

Modern Engineering Decoded:Continuous analog AC or audio-frequency electrical waveform.
Historical note: Bell's central legal weapon against telegraph companies who relied on pulsed DC make-and-break circuits.
“Subdivision of the Electric Light”1870s–1880s (Edison era)
19th-C Meaning:

The problem of operating numerous small domestic lamps off a single electrical generator.

Modern Engineering Decoded:Parallel circuit wiring of high-resistance incandescent electrical loads.
Historical note: Pundits claimed it was physically impossible until Edison increased filament resistance to 100 ohms.
“Optically Anisotropic Solution”1960s (Kwolek era)
19th-C Meaning:

A liquid solution that exhibits direction-dependent refractive indices due to molecular alignment.

Modern Engineering Decoded:Liquid crystalline nematic phase polymer dope.
Historical note: Technicians initially tried to throw out Kwolek's cloudy solution thinking it was contaminated.
“Unitary Body of Semiconductor Material”1950s–1960s (Noyce era)
19th-C Meaning:

A single continuous crystal structure of silicon or germanium.

Modern Engineering Decoded:Monolithic single-crystal silicon die / integrated circuit wafer.
Historical note: Differentiated Noyce's monolithic planar circuit from Jack Kilby's hybrid flying-wire prototype.
“Peculiar and Novel Construction”19th Century
19th-C Meaning:

A distinctive, patentable structural arrangement not found in prior art.

Modern Engineering Decoded:Novel and non-obvious mechanical embodiment under 35 U.S.C. § 103.
Historical note: Standard 19th-century legal terminology establishing novelty.

Museum Broadside & Archival Print Edition

Authentic archival layout formatted for framing, study, and high-resolution printing

Paper:
Theme:
The United States Patent & Trademark Archive

Historical Specification & Engineering Broadside

Curated, Verified & Restored by Classic Patents (classic-patents.com)
APPARATUS FOR TREATING AIRA sprayed-air washer with sinuous separator plates for particle and droplet removal
US 808,897Class: Air-purifying apparatus
Inventor(s):Willis H. Carrier
Origin / Location:Buffalo, New York
Grant & Filing:Filed September 16, 1904 · Granted January 2, 1906

I. Historical Context & Grant Summary

US 808,897 claims an air-purifying apparatus in which a fine spray wets suspended material and an upright, zigzag plate separator removes liquid and the material captured by it. This 1904 filing is specifically about the construction and action of the separator plates, rather than a later Carrier environmental-control system.

II. Core Mechanism & Scientific Principles

Carrier washes an air stream with a fine liquid spray, then sends that wet stream through repeated turns between shaped upright plates. Dirt is thrown into the wet film; the plate geometry then removes free droplets while keeping the pressure loss modest.

Physical Operation:A fan K moves air through casing M. Spray device H makes a fine liquid spray. The front plate faces i remain wet and collect suspended matter as the air turns through them. Rear flanges b and c form gutters that interrupt liquid travel across the later bends, separating free droplets before the air leaves the apparatus.
Governing Formulation:
Inertial impaction in a turning flow:\text{Stk} = \frac{\rho_p d_p^2 u_0}{18 \mu D} \quad \text{and} \quad \eta_{\text{impaction}} = f(\text{Stk})
Gravity drainage and liquid-film capture:q_{\text{film}} = \frac{\rho g \delta^3}{3 \mu} \quad \text{and} \quad \Delta P_{\text{loss}} = \zeta \frac{\rho v^2}{2}

III. The Granted Legal Monopoly (Key Claims)

Claim 1 (Independent)Two-zone plate surface with unobstructed wet front portion

Claim 1 covers the complete separator assembly inside an air conduit. Each upright plate must have successive oblique faces that make a continuous sinuous surface; its front portion remains unobstructed so liquid can spread from face to face, while the succeeding portion has projections that stop liquid from continuing along the conduit and help remove it from the air. The plates must be spaced to make the matching continuous sinuous air passages.

Claim 2 (Independent)Air-moistening means coupled to the separator

Claim 2 claims the air-moistening combination with the separator. It requires moistening means, an air conduit, and spaced upright plates whose upright bends produce oblique faces and sinuous passages. It then specifies smooth, unobstructed front plate surfaces and surface projections in the succeeding plate portions that obstruct liquid travel lengthwise of the conduit. Unlike Claim 1, this wording expressly includes the means that wet the incoming air.

Claim 3 (Independent)Upright bends defining continuous sinuous air passages

Claim 3 narrows the moistening-air apparatus to the bend-and-gutter arrangement. The spaced upright plates must have upright bends that define continuous sinuous air passages, and some of those bends must carry projecting flanges. Those flanges form upright gutters, making the drainage and droplet-separation feature itself part of the claimed combination.

IV. Mechanical Organ Breakdown

Spray device HTerm: “Atomized spray” → Fine-droplet air washer spray

A supply pipe and whirling nozzles distribute treating liquid through the incoming air.

Sinuous separator platesTerm: “Separator plates or elements” → Wet baffle or mist-eliminator plates

Upright plates make the air follow a sequence of oblique turns.

Rear flanges and guttersTerm: “Flanges or lips” → Droplet-separation gutters

The plate's rear section limits liquid flow across successive faces to remove droplets from air.

CLASSIC PATENTS DIGITAL ARCHIVE • PERMANENT EXHIBIT ID: us-808897-carrier-air-conditioner
classic-patents.com/patents/us-808897-carrier-air-conditioner
Original USPTO PDF
Classic Patents/US 808,897
Progressive Era (1900–1920)Air Treatment & Environmental Engineering

Wet-Plate Air Purifier

US 808,897

A sprayed-air washer with sinuous separator plates for particle and droplet removal

Inventor(s)Willis H. Carrier
Grant DateJanuary 2, 1906
Filing DateSeptember 16, 1904
LocationBuffalo, New York
US 808,897 claims an air-purifying apparatus in which a fine spray wets suspended material and an upright, zigzag plate separator removes liquid and the material captured by it. This 1904 filing is specifically about the construction and action of the separator plates, rather than a later Carrier environmental-control system.
USPTO PDF
Audio Engineering Breakdown~1 min listen

Listen to the narrated mechanical breakdown and civilizational context

Engineering Analysis & Physical Principles

How It Works: Step-by-Step Mechanical & Physical Breakdown

Carrier washes an air stream with a fine liquid spray, then sends that wet stream through repeated turns between shaped upright plates. Dirt is thrown into the wet film; the plate geometry then removes free droplets while keeping the pressure loss modest.
The Core Breakthrough Mechanism

A fan K moves air through casing M. Spray device H makes a fine liquid spray. The front plate faces i remain wet and collect suspended matter as the air turns through them. Rear flanges b and c form gutters that interrupt liquid travel across the later bends, separating free droplets before the air leaves the apparatus.

Interactive Real-Time Physical Simulation

Drag to rotate · Pinch to zoom · Shared controls update the displayed model
INITIALIZING THREE.JS WEBGL SIMULATION...
Wet-Plate Sinuous Air Washer and Droplet Separator.
Host-Model Telemetry/Computed Readout
Wet-Plate Sinuous Air Washer and Droplet Separator
Separator State
Source
WET-SURFACE REMOVALtopology[1]
Droplet Separation
Modern Model
53.3%%[1]
Impurity Capture
Modern Model
36.2%%[1]
Wet-Film Coverage
Modern Model
53.3%%[1]
Separator Pressure Loss
Modern Model
230.93 PaPa[M/LT²]
Air Flow Power
Modern Model
1634.8 WW[ML²/T³]
Separator Air Velocity & Pressure Loss
∂ΔP / ∂CFM (host sensitivity)
0.008 Pa / cfm
Treated Airflow15000 cfm
Spray Nozzle Rate60 %
Sinuous Plate Faces / Turns6 faces
Energy · thermo_fluid
Fan work
1,635 W
Separator resistance
1,635 W
Interval ghosts
Wet film53.3 % · [0, 100]
Dust capture36.2 % · [0, 99]
Droplet separation53.3 % · [0, 99]
Fidelity / MMS residual
Dust capture on wet front film
model36.2 %
referencesource relation only %
residual53.3 %
Coupled channels
fan → sinuous separator1635 W
Dated scenarios

Detailed Component Architecture

1Spray device H
A supply pipe and whirling nozzles distribute treating liquid through the incoming air.

The specification permits water or another treating liquid. Its shown nozzles h impart circular motion to the issuing liquid to make a fine spray; it does not state a refrigeration temperature, pump pressure, or automatic environmental controller.

19th-C. Term: Atomized sprayModern: Fine-droplet air washer spray
2Sinuous separator plates
Upright plates make the air follow a sequence of oblique turns.

The turns bring the stream into contact with wetted faces. Inertia and the curved path drive suspended solid material toward the liquid film, which carries it down to trap J and filter or sieve L.

19th-C. Term: Separator plates or elementsModern: Wet baffle or mist-eliminator plates
3Rear flanges and gutters
The plate's rear section limits liquid flow across successive faces to remove droplets from air.

Projections b and c obstruct liquid motion at the bends, while gutter a collects liquid at the rear edge. The claim language makes the unobstructed wet front and obstructed rear a deliberate two-stage arrangement.

19th-C. Term: Flanges or lipsModern: Droplet-separation gutters
Engineering Principles & Equations

Governing Equations & Engineering Principles

Authored explanation paired with its stated mathematical relation

Claim 1: Wet Front Plates and Rear Liquid-Separation Projections

Source-Bound Air-Washer GeometryClaim 1
Mathematical Governing Law
Terms:
Plain English DecoderHover or tap any highlighted phrase
Claim 1 puts a ahead of . Their rear portions use to interrupt liquid travel and promote separation from the air.
sprayHspray H
Fine treating-liquid spray
The finely divided water or other suitable treating liquid introduced by the source's spray device H.
source construction element

The printed grant names water or another suitable treating liquid and describes whirling nozzles. It does not give a liquid temperature, pressure, droplet-size distribution, or refrigeration system.

Physical Principle & Engineering Insight

This is a Claim 1 construction relation, not a quantitative psychrometric law. US 808,897 prints no chilled-water temperature, dew point, humidity ratio, enthalpy equation, refrigeration capacity, reheat temperature, air-flow rate, or automatic setpoint for the apparatus.

Historical Context: The card directs readers to the grant's actual separation mechanism: wet front plate faces capture material, while rear projections and gutters promote removal of free liquid from the air stream.

Inertial impaction in a turning flowAuthored Principle 1
Stated relationStk=ρpdp2u018μDandηimpaction=f(Stk)\text{Stk} = \frac{\rho_p d_p^2 u_0}{18 \mu D} \quad \text{and} \quad \eta_{\text{impaction}} = f(\text{Stk})
The document says that particles are thrown against the wet film by their inertia and by centrifugal force from the sinuous air path. In modern terms, a particle cannot follow every abrupt streamline turn as readily as the carrier gas, so it contacts the wetted surface.
Gravity drainage and liquid-film captureAuthored Principle 2
Stated relationqfilm=ρgδ33μandΔPloss=ζρv22q_{\text{film}} = \frac{\rho g \delta^3}{3 \mu} \quad \text{and} \quad \Delta P_{\text{loss}} = \zeta \frac{\rho v^2}{2}
The front plate surfaces intentionally remain wet. Captured material is washed downward by that film into basin or trap J, while the rear plate geometry seeks to separate free liquid from the outgoing air.

Interactive Schematic Sheet (Fig. 1)

Part elevation and part vertical section of the air-treatment apparatus described in US 808,897.

1.00x
US 808,897 · FIG. 1Fine spray hWet faces i / bends jRear flanges b / cTrap J / filter LWet air washing and sinuous liquid separation
Tap any numbered pin4 Curated Callouts
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Why It Still Matters

The patent records a practical early air-washer and mist-separator problem: create wet contact for particle capture, then prevent liquid carryover. Its complete source also matters because it distinguishes this plate-separator grant from Carrier's other air-treatment work.

Legal Claims Decoder (5 Numbered Claims)

Compare dense legalistic claims directly with decoded plain-English functional specifications.
Claim #1Independent Master Claim
1/5
Verbatim Historical Legal Text
“In an air-purifying apparatus, the combination of an air-conduit and a separator therein comprising upright plates, each having a succession of oblique faces forming a continuous sinuous surface lengthwise of the conduit and having the front portion of such surface unobstructed to permit the distribution of the liquid along the plate from one face to another, and having its succeeding portion provided with projections which obstruct the flow of the liquid lengthwise of the conduit and promote the separation of the liquid from the air, the plates being spaced from each other to form continuous sinuous air-passages between them, substantially as set forth.”
Plain English Engineering Translation
Claim 1 covers the complete separator assembly inside an air conduit. Each upright plate must have successive oblique faces that make a continuous sinuous surface; its front portion remains unobstructed so liquid can spread from face to face, while the succeeding portion has projections that stop liquid from continuing along the conduit and help remove it from the air. The plates must be spaced to make the matching continuous sinuous air passages.
Key Protected Innovations:
Two-zone plate surface with unobstructed wet front portionProjected rear portion that interrupts lengthwise liquid flowSpaced plates forming continuous sinuous conduit passages

The Historical Bottleneck

An air washer needs to expose suspended material to liquid, then remove the liquid and captured material without allowing the air to bypass the separator path.

Why Prior Art Failed

  • •A simple spray can leave liquid droplets entrained in the outgoing air.
  • •A plate that drains liquid too early loses wet contact area; a plate that retains too much liquid can leave carryover.
The Breakthrough Insight
“Carrier divides the plate into a wet, unobstructed front contact zone and a rear zone with projections and gutters, so the same sinuous path can first capture material and then separate liquid.”
After the Grant
The printed grant identifies Buffalo Forge Company as assignee. This edition limits its historical claims to what the primary facsimile and its masthead establish.
Civilizational Impact
The document is an early industrial treatment of air washing and mist separation. It should not be used as evidence for thermal or moisture-control features absent from its source.