US3871972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrorecording sheet
Assignee: Panasonic Holdings Corp
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Filing: 1973-01-03
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Granted: 1975-03-18
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Expires: 1993-01-03
Abstract
Abstract An electrorecording sheet in which an electroconductive layer comprising cuprous iodide is provided in contact with a color forming layer containing a component which shows visual color change or color formation upon application of heat energy thereto. When current is applied to the color forming layer through said electroconductive layer, selective visible recording is obtained in the current-applied area of said color forming layer.
Inventors
- 👤 Yoichi Sekine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:40
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
74 words
AN ELECTRO-RECORDING SHEET HAVING AN ELECTROCONDUCTIVE LAYER OF CUPROUS IODIDE WHICH HAS A SURFACE RESISTIVITY OF LESS THAN 10**6 AT A TEMPERATURE OF 20*C AND A RELATIVE HUMIDITY OF 65 PERCENT AND A COLOR FORMING LAYER PROVIDED IN CONTACR WITH SAID ELECTROCONDUCTIVE LAYER AND WHICH FORMS A MARK DUE TO SELECTIVE COLOR FORMATION OR COLOR CHANGE IN THE PARTS OF SAID COLOR FORMATION LAYER TO WHICH ELECTRIC CURRENT IS APPLIED THROUGH SAID ELECTROCONDUCTIVE LAYER.
Claim 2
Dependent Claim
74 words
AN ELECTRO-RECORDING SHEET HAVING AN ELECTROCONDUCTIVE LAYER OF CUPROUS IODIDE WHICH HAS A SURFACE RESISTIVITY OF LESS THAN 10**6 AT A TEMPERATURE OF 20*C AND A RELATIVE HUMIDITY OF 65 PERCENT AND A COLOR FORMING LAYER PROVIDED IN CONTACR WITH SAID ELECTROCONDUCTIVE LAYER AND WHICH FORMS A MARK DUE TO SELECTIVE COLOR FORMATION OR COLOR CHANGE IN THE PARTS OF SAID COLOR FORMATION LAYER TO WHICH ELECTRIC CURRENT IS APPLIED THROUGH SAID ELECTROCONDUCTIVE LAYER.
Claim 3
Dependent Claim
29 words
An electro-recording sheet according to claim 1, wherein the electroconductive layer comprises homogeneous component of only cuprous iodide wherein conductivity of said electroconductive layer is imparted by cuprous iodide.
Claim 4
Dependent Claim
35 words
An electro-recording sheet according to claim 1, wherein the electroconductive layer comprises binder and particles of cuprous iodide which are dispersed in said binder wherein conductivity of said electroconductive layer is imparted by cuprous iodide.
Claim 5
Dependent Claim
38 words
An electro-recording sheet according to claim 1, wherein the color forming layer comprises leuco form of triphenylmethane dyes or leuco form of fluoran dyes and an organic acid or a phenolic material which are separately dispersed in binders.
Claim 6
Dependent Claim
65 words
An electro-recording sheet according to claim 1, wherein the color forming layer comprises a metal salt and an organic spot test reagent which rapidly reacts with metal ion of said metal salt to form a visible reaction product which are separately dispersed in binders and either one of said two materials which has a lower melting point has a melting point of 70* - 150*C.
Claim 7
Dependent Claim
23 words
An electro-recording sheet according to claim 1, wherein the color forming layer comprises leuco form of an oxidation-reduction indicator dispersed in a binder.
Claim 8
Dependent Claim
38 words
An electro-recording sheet according to claim 1, wherein the color forming layer comprises a metal chloride or oxide which forms color or changes color with reduction upon application of electric current and which is dispersed in a binder.
Claim 9
Dependent Claim
62 words
An electro-recording sheet according to claim 1, which comprises a support of paper or plastic film, an electroconductive layer containing cuprous iodide provided on said support and a color forming layer comprising leuco form of triphenylmethane dyes or leuco form of fluoran dyes and an organic acid or a phenolic material dispersed in a binder which is provided on said electroconductive layer.
Claim 10
Dependent Claim
52 words
An electro-recording sheet according to claim 1, which comprises a support of paper or plastic film, an electroconductive layer containing cuprous iodide provided on said support, and a color forming layer comprising a metal salt and an organic spot test reagent dispersed in a binder which is provided on said electroconductive layer.
Claim 11
Dependent Claim
45 words
An electro-recording sheet according to claim 1, which comprises a support of paper or plastic film, an electroconductive layer containing cuprous iodide and a color forming layer comprising leuco form of an oxidation-reduction indicator dispersed in a binder which is provided on said electroconductive layer.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |