US2983654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical recording
Assignee: Timefax Corp
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Filing: 1958-09-30
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Granted: 1961-05-09
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Expires: 1978-09-30
Abstract
No abstract record available.
Inventors
- 👤 Harold R Dalton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:32
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/20; B41M5/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
ELECTROSENSITIVE SHEET MATERIAL ESPECIALLY PREPARED FOR ELECTROLYTIC MARKING IN RESPONSE TO APPLIED ELECTRIC CURRENTS AND BEING IN THE FORM OF A POROUS WEB OF WHITISH BACKGROUND WETTED WITH A CONDUCTIVE NORMALLY COLORLESS ELECTROLYTIC MARKING SALT SOLUTION SUCH AS USED IN FACSIMILE RECORDING AND WHICH HAS ADDED THERETO A COLOR FORMING AGENT IN THE FORM OF A QUINOLINE DERIVATIVE AND WHICH REACTS WITH IONS FROM A RECORDING ELECTRODE TO PRODUCE A COLORED MARK, SAID AGENT HAVING THE FOLLOWING CHEMICAL STRUCTURE
Claim 2
Dependent Claim
79 words
ELECTROSENSITIVE SHEET MATERIAL ESPECIALLY PREPARED FOR ELECTROLYTIC MARKING IN RESPONSE TO APPLIED ELECTRIC CURRENTS AND BEING IN THE FORM OF A POROUS WEB OF WHITISH BACKGROUND WETTED WITH A CONDUCTIVE NORMALLY COLORLESS ELECTROLYTIC MARKING SALT SOLUTION SUCH AS USED IN FACSIMILE RECORDING AND WHICH HAS ADDED THERETO A COLOR FORMING AGENT IN THE FORM OF A QUINOLINE DERIVATIVE AND WHICH REACTS WITH IONS FROM A RECORDING ELECTRODE TO PRODUCE A COLORED MARK, SAID AGENT HAVING THE FOLLOWING CHEMICAL STRUCTURE
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) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |