Patent US3185995A successfully refreshed from Google Patents.
US3185995A
Expired / Lapsed
US
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Electrostatic recording process
Assignee: EIDP Inc
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Filing: 1962-03-05
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Granted: 1965-05-25
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Expires: 1982-03-05
Abstract
No abstract record available.
Inventors
- 👤 John E Dickens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:26
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/80; G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G06; G06K; G06K1/00; G06K1/12; G06K1/128; G11; G11B; G11B9/00; G11B9/08; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN THE PROCESS OF ELECTROSTATIC RECORDING WHEREIN A DIELECTRIC RECORDING TAPE IS PASSED BETWEEN A PAIR OF ELECTRODES, A FRONTAL RECORDING ELECTRODE AND A BACKING ELECTRODE, AND IS SUBJECTED TO A VOLTAGE ACROSS THE ELECTRODES, SAID VOLTAGE BEING ABOVE THE THRESHOLD VOLTAGE FOR CURRENT FLOW TO SAID DIELECTRIC TAPE AND ALSO BEING DIRECTLY RELATED TO A SIGNAL VOLTAGE WHEREBY A CHARGE IS IMPRESSED IN SAID DIELECTRIC TAPE CORRESPONDING TO THE SIGNAL, THE IMPROVEMENT WHEREIN THE SURFACE OF THE DIELECTRIC TAPE DISTANT FROM SAID FRONTAL RECORDING ELECTRODE IS ELECTRICALLY CONDUCTIVE.
Claim 2
Dependent Claim
89 words
IN THE PROCESS OF ELECTROSTATIC RECORDING WHEREIN A DIELECTRIC RECORDING TAPE IS PASSED BETWEEN A PAIR OF ELECTRODES, A FRONTAL RECORDING ELECTRODE AND A BACKING ELECTRODE, AND IS SUBJECTED TO A VOLTAGE ACROSS THE ELECTRODES, SAID VOLTAGE BEING ABOVE THE THRESHOLD VOLTAGE FOR CURRENT FLOW TO SAID DIELECTRIC TAPE AND ALSO BEING DIRECTLY RELATED TO A SIGNAL VOLTAGE WHEREBY A CHARGE IS IMPRESSED IN SAID DIELECTRIC TAPE CORRESPONDING TO THE SIGNAL, THE IMPROVEMENT WHEREIN THE SURFACE OF THE DIELECTRIC TAPE DISTANT FROM SAID FRONTAL RECORDING ELECTRODE IS ELECTRICALLY CONDUCTIVE.
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) | 1968-05-24 | 1968-11-23 | 1969-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-24 | 1972-11-23 | 1973-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-24 | 1976-11-23 | 1977-05-25 | $7700.00 | Window Closed / Lapsed |