Patent US4375492A successfully refreshed from Google Patents.
US4375492A
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US
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Dielectric record material
Assignee: WTA Inc
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Filing: 1981-05-22
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Granted: 1983-03-01
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Expires: 2001-05-22
Abstract
Abstract A reactive dielectric record material is disclosed which comprises certain chromogenic material and certain phenolic material. This record material produces images by means of a dielectric process wherein two color-forming agents contained within a reactive image-bearing surface are brought into reactive, color-producing contact by means of colorless toner material.
Inventors
- 👤 Richard E. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:52
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G9/00; G03G9/08; G03G9/09; G03G9/0928; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24934; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
A dielectric record material which comprises: (a) an electrically conductive substrate and (b) an electrically insulating coating on the surface of the substrate comprising dielectric polymer material and a color-forming composition comprising: (i) at least one basic chromogenic material; and (ii) phenolic material selected from the group consisting of phthaleins and resorcinol monobenzoate which will react with said chromogenic material to form a fixed colored mark upon application of a substantially colorless toner comprising a material which will provide mutual solution or co-melting of said reactants in selective areas of the record material upon the application of heat or solvent vapors.
Claim 2
Dependent Claim
101 words
A dielectric record material which comprises: (a) an electrically conductive substrate and (b) an electrically insulating coating on the surface of the substrate comprising dielectric polymer material and a color-forming composition comprising: (i) at least one basic chromogenic material; and (ii) phenolic material selected from the group consisting of phthaleins and resorcinol monobenzoate which will react with said chromogenic material to form a fixed colored mark upon application of a substantially colorless toner comprising a material which will provide mutual solution or co-melting of said reactants in selective areas of the record material upon the application of heat or solvent vapors.
Claim 3
Dependent Claim
22 words
The record material of claim 1 in which the chromogenic material is selected from the group consisting of phthalides, pyridinones and fluorans.
Claim 4
Dependent Claim
27 words
The record material of claim 2 in which the chromogenic material is selected from the group consisting of Crystal Violet Lactone, Indolyl Red, Pyridyl blue and N-102.
Claim 5
Dependent Claim
14 words
The record material of claim 3 in which the phenolic material is a phthalein.
Claim 6
Dependent Claim
12 words
The record material of claim 4 in which the phthalein is phenolphthalein.
Claim 7
Dependent Claim
14 words
The record material of claim 5 in which the chromogenic material is Pyridyl Blue.
Claim 8
Dependent Claim
14 words
The record material of claim 6 in which the chromogenic material further includes N-102.
Claim 9
Dependent Claim
15 words
The record material of claim 5 in which the chromogenic material is Crystal Violet Lactone.
Claim 10
Dependent Claim
14 words
The record material of claim 8 in which the chromogenic material further includes N-102.
Claim 11
Dependent Claim
21 words
The record material according to claim 6, 7, 8 or 9 wherein the dielectric polymer material is an acrylic latex emulsion.
Claim 12
Dependent Claim
18 words
The record material of claim 10 in which the dielectric polymer material further includes carboxylated vinyl acetate copolymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |