Patent US3620831A successfully refreshed from Google Patents.
US3620831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic recording medium
Assignee: Honeywell Inc
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Filing: 1968-12-30
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Granted: 1971-11-16
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Expires: 1988-12-30
Abstract
Abstract Zinc stearate, other hydrophobic metal salts of organic fatty acids, and, in some instances, the acids themselves, are coated on a substrate such as paper to provide electrographic media of unusually low cost and resistance to high humidity. The coating materials can be selected for application in powder or extruded form, from a water-compatible solvent, or from an organic solvent.
Inventors
- 👤 Floyd T Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:05
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0214; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
An electrographic medium as defined in claim 1 in which said metallic salt is insoluble in water is is soluble in ammonia and water.
Claim 2
Dependent Claim
24 words
An electrographic medium as defined in claim 1 in which said metallic salt is relatively insoluble in water and is soluble in organic solvents.
Claim 3
Dependent Claim
27 words
An electrographic medium as defined in claim 1 in which said metallic salt is soluble in other than a water solvent and is solid at room temperature.
Claim 4
Dependent Claim
31 words
An electrographic medium as defined in claim 1 in which said metallic salt is further characterized in that it provides a writing surface at room temperature and in said high-humidity environment.
Claim 5
Dependent Claim
21 words
An electrographic medium as defined in claim 1 wherein at least a major portion of said dielectric coating is zinc stearate.
Claim 6
Dependent Claim
17 words
An electrographic medium as defined in claim 1 wherein said coating is a solid at room temperature.
Claim 7
Dependent Claim
129 words
A process of manufacturing an electrographic medium having a paper substrate coated with a continuous discrete dielectric surface layer, said process comprising the successive steps of a. dissolving a solute, consisting essentially of a metallic salt of an organic fatty acid, in an ammonia and water solvent, and providing sufficient solute in the solution to coat only a surface with said solute when covered with the solution, wherein said slat has a metal ion selected from the group metals consisting of zinc, nickel, copper, and cobalt and wherein said organic fatty acid radical is selected from the group consisting of stearates, palmitates, oleates, laurates, and linoleates; b. coating said substrate with said solution; and c. drying said coating on said substrate to harden said salt to a hydrophobic coating.
Claim 8
Dependent Claim
33 words
A process as defined in claim 8 in which said solution is coated on a wet, uncalendered paper mat, and comprising the further step of calendering said substrate subsequent to said coating step.
Claim 9
Dependent Claim
100 words
A process for manufacturing an electrographic medium comprising the steps of providing a paper substrate, applying to the surface of the substrate a continuous, thin, hydrophobic dielectric coating consisting essentially of a hydrophobic and stable metal salt of an organic fatty acid, wherein said metal ion in said salt is selected from the group of metals consisting of zinc, nickel, copper, cobalt, aluminum, lithium, mercury, tin, lead, manganese, iron, and bismuth, and wherein said organic fatty acid radical is selected from the group consisting of stearates, palmitates, oleates, laurates, and linoleates, and maintaining said substrate substantially free of said salt.
Claim 10
Dependent Claim
17 words
A prOcess as defined in claim 10 in which said salt is soluble in ammonia and water.
Claim 11
Dependent Claim
16 words
A process as defined in claim 10 in which said salt is soluble in organic solvents.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |