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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)
ELECTRONICALLY ADDRESSABLE MICROENCAPSULATED INK AND DISPLAY THEREOFElectrophoretic Contrast Media, Printed Electronic Inks, and Addressable Displays
US 6,120,588Class: U.S. Cl. 106/31.16; 106/31.32; 106/31.64; 106/31.92; 264/6, 10, 12, 7; 425/6, 130, 174.8 E; 427/7
Inventor(s):Joseph M. Jacobson
Origin / Location:Cambridge, Massachusetts
Grant & Filing:Filed September 23, 1997 · Granted September 19, 2000

I. Historical Context & Grant Summary

US Patent 6,120,588 describes electronically active ink systems and printing systems for laying down electronically addressable contrast media, conductors, insulators, resistors, semiconductive, magnetic, spin, piezoelectric, optoelectronic, thermoelectric, and radio-frequency materials in patterned structures.

II. Core Mechanism & Scientific Principles

The grant is broader than the later E Ink product story: it describes electronically addressable contrast media together with printable conductors, semiconductors, logic, sensors, actuators, and radio-frequency structures.

Physical Operation:The specification gives several source embodiments. In the electrophoretic embodiment, oppositely charged particles in a microcapsule migrate toward opposite electrodes under an applied field; other embodiments use dielectrophoresis, frequency-dependent dielectric response, chemical color change, or printed functional inks.
Governing Formulation:
Electrophoretic particle migration:v_d = \mu_e E

III. The Granted Legal Monopoly (Key Claims)

Claim 1 (Independent)Electrically addressable microcapsule

Claim 1 covers an electrically addressable microcapsule containing two particles with respective charges, where a field of a stated polarity changes the perceived optical property by moving at least one particle in the field-responsive direction.

Claim 2 (Dependent)Two-particle field response

Claim 2 narrows claim 1 by requiring that both charged particles move in response to the applied electric field, rather than leaving movement of only one particle within the capsule sufficient.

Claim 3 (Dependent)Colored first particle

Claim 3 narrows the charged-particle system by requiring that the first particle itself has a color, making its movement capable of changing the capsule’s perceived optical state.

IV. Mechanical Organ Breakdown

Polymeric MicroencapsulationTerm: “” →

Microencapsulation forms a shell around an electronically active internal phase.

Active Matrix AddressingTerm: “” →

Electrodes address the encapsulated contrast medium from the top, bottom, or in-plane.

CLASSIC PATENTS DIGITAL ARCHIVE • PERMANENT EXHIBIT ID: us-6120588-eink
classic-patents.com/patents/us-6120588-eink
Original USPTO PDF
Classic Patents/US 6,120,588
Internet & Modern Computing (1990–Present)Optoelectronics & Electronic Paper

Jacobson Electronically Addressable Microencapsulated Ink

US 6,120,588

Electrophoretic Contrast Media, Printed Electronic Inks, and Addressable Displays

Inventor(s)Joseph M. Jacobson
Grant DateSeptember 19, 2000
Filing DateSeptember 23, 1997
LocationCambridge, Massachusetts
US Patent 6,120,588 describes electronically active ink systems and printing systems for laying down electronically addressable contrast media, conductors, insulators, resistors, semiconductive, magnetic, spin, piezoelectric, optoelectronic, thermoelectric, and radio-frequency materials in patterned structures.
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

The grant is broader than the later E Ink product story: it describes electronically addressable contrast media together with printable conductors, semiconductors, logic, sensors, actuators, and radio-frequency structures.
The Core Breakthrough Mechanism

The specification gives several source embodiments. In the electrophoretic embodiment, oppositely charged particles in a microcapsule migrate toward opposite electrodes under an applied field; other embodiments use dielectrophoresis, frequency-dependent dielectric response, chemical color change, or printed functional inks.

Interactive Real-Time Physical Simulation

Drag to rotate · Pinch to zoom · Shared controls update the displayed model
INITIALIZING THREE.JS WEBGL SIMULATION...
Electrophoretic Particle Mobility & Optical Contrast.
Host-Model Telemetry/Computed Readout
Electrophoretic Particle Mobility & Optical Contrast
Surface Reflectance
Modern Model
65.1%R_top[1]
Electric Field Intensity
Modern Model
0.30 V/μmE[1]
Electrophoretic Particle Velocity
∂v_particle / ∂V_electrode (host sensitivity)
0.045 mm·s⁻¹ / V
Electrode Potential+15 V
Dielectric Fluid Viscosity2 cP
Energy · colloidal_physics
Electrode Drive
0 W
Electrophoretic Drift
0 W
Microcapsule Fluid Drag
0 W
Interval ghosts
V_pix15.0 V · [5, 25]
Fidelity / MMS residual
Ship speed vs Francis B. Ogden Thames trial
model10.0 knots
reference9.5 knots
residual0.5 knots
Coupled channels
electrode drive → electrophoretic translation0 W
Dated scenarios

Detailed Component Architecture

1Polymeric Microencapsulation
Microencapsulation forms a shell around an electronically active internal phase.

The source discusses optical clarity, dielectric strength, impermeability, pressure resistance, and several encapsulation routes; it does not limit the invention to a single capsule size or pigment chemistry.

2Active Matrix Addressing
Electrodes address the encapsulated contrast medium from the top, bottom, or in-plane.

The source labels top and bottom electrodes 100 and 110 for one embodiment and in-plane electrodes 270 and 280 for another; it does not prescribe the later product’s TFT stack or drive voltage.

Engineering Principles & Equations

Governing Equations & Engineering Principles

Authored explanation paired with its stated mathematical relation

Stokes-Einstein Electrophoretic Drift Velocity

Optoelectronics & Microencapsulated Colloid DynamicsClaim 1
Mathematical Governing Law
Terms:
Plain English DecoderHover or tap any highlighted phrase
Electrophoretic drift of charged pigment nanoparticles scales with and applied , and is inversely resisted by fluid and .
vv
Electrophoretic Drift Velocity
Translational velocity of TiO2 / carbon black particles inside the microcapsule
m/s

Determines display response latency; switching times of ~100–300 ms result from micrometer-scale particle migration across the 50 μm capsule cavity.

Physical Principle & Engineering Insight

Because electrophoretic motion ceases the instant the electric field is removed and particles remain held by van der Waals forces, E-Ink exhibits true bistability with zero power consumption in static states.

Historical Context: Created the physics foundation for the Amazon Kindle and worldwide electronic paper publishing.

Electrophoretic particle migrationAuthored Principle 1
Stated relationvd=μeEv_d = \mu_e E
The grant establishes directional particle migration under an applied electric field; the displayed kernel uses a bounded illustrative mobility and does not claim that the patent reports a measured mobility, switching time, reflectance, or contrast ratio.

Why It Still Matters

The grant’s broader printing-system vision connects addressable contrast media with printed electronics, but later commercial products and their performance are historical context rather than limitations proved by this patent.

Legal Claims Decoder (18 Numbered Claims)

Compare dense legalistic claims directly with decoded plain-English functional specifications.
Claim #1Independent Master Claim
1/18
Verbatim Historical Legal Text
“An electrically addressable ink comprising a microcapsule, said microcapsule comprising: a first particle having a first charge; and a second particle having a second charge; wherein applying an electric field having a first polarity to said microcapsule effects a perceived optical property change by causing one of said first and second particles to migrate in a direction responsive to said field.”
Plain English Engineering Translation
Claim 1 covers an electrically addressable microcapsule containing two particles with respective charges, where a field of a stated polarity changes the perceived optical property by moving at least one particle in the field-responsive direction.
Key Protected Innovations:
Electrically addressable microcapsuleCharged particlesField-responsive optical change

The Historical Bottleneck

For decades, engineers sought an electronic screen with the readability, wide viewing angles, and zero-power bistability of printed ink on paper.

Why Prior Art Failed

  • •Early electrophoretic cells clustered and settled after days
  • •Liquid crystal displays consumed heavy backlight power
  • •Severe eye strain under emissive LCD reading
The Breakthrough Insight
“Jacobson’s claimed move was to treat electronically functional matter as an ink and pair it with patterning methods, including encapsulated contrast media and printed conductors, semiconductors, logic, and actuators.”

Patent Wars & Legal Litigations

Vs. Xerox Gyricon / Nick SheridonInfringement Challenge
Rival Claim & Defense:
Rotating bichromal sphere twisting ball display (US Patent 4,126,854)
Litigation Conflict:
Xerox developed twisting bichromal beads; E-Ink developed translating sub-micron colloidal particles in liquid microcapsules.
Final Resolution & Judicial Outcome:
E-Ink achieved much higher optical contrast and resolution, becoming the global commercial standard.
Civilizational Impact
The patent supplied a foundational vocabulary for printable electronic structures and addressable contrast media; later electronic-paper products are downstream implementations, not a substitute for the grant’s much wider disclosure.