US2979402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing
Assignee: RCA Corp
•
Filing: 1956-07-31
•
Granted: 1961-04-11
•
Expires: 1976-07-31
Abstract
No abstract record available.
Inventors
- 👤 Harold G Greig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:21
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/087; G03G13/00; G03G13/22; G03G5/043; G03G5/0433
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
AN ELECTROPHOTOGRAPHIC RECORDING ELEMENT INCLUDING A PHOTOCONDUCTING INSULATING STRATUM COMPRISING PARTICLES OF PHOTOCONDUCTING ZINC OXIDE DISPERSED IN AN ELECTRICALLYINSULATING, SOLID, FILM-FORMING VEHICLE IN CONTACT WITH A SEMICONDUCTING SUBSTRATUM COMPRISING PARTICLES OF A SEMICONDUCTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF SEMICONDUCTING ZINC OXIDE, STANNIC OXIDE, TITANIUM DIOXIDE AND BASIC LEAD CARBONATE, IN A SOLID, FILM-FORMING VEHICLE, SAID PHOTOCONDUCTING STRATUM HAVING A LONG BARK DECAY RELATIVE TO THE DARK DECAY OF SAID SUBSTRATUM, THE WEIGHT RATIO OF PHOTOCONDUCTING ZINC OXIDE TO VEHICLE IN SAID STRATUM BEING BETWEEN 50/50 AND 90/10, AND THE VEHICLE BEING PRESENT IN SAID SUBSTRATUM IN PROPORTIONS UP TO ONE PART BY WEIGHT VEHICLE TO TWO AND A HALF PARTS BY WEIGHT SEMICONDUCTING MATERIAL
Claim 2
Dependent Claim
116 words
AN ELECTROPHOTOGRAPHIC RECORDING ELEMENT INCLUDING A PHOTOCONDUCTING INSULATING STRATUM COMPRISING PARTICLES OF PHOTOCONDUCTING ZINC OXIDE DISPERSED IN AN ELECTRICALLYINSULATING, SOLID, FILM-FORMING VEHICLE IN CONTACT WITH A SEMICONDUCTING SUBSTRATUM COMPRISING PARTICLES OF A SEMICONDUCTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF SEMICONDUCTING ZINC OXIDE, STANNIC OXIDE, TITANIUM DIOXIDE AND BASIC LEAD CARBONATE, IN A SOLID, FILM-FORMING VEHICLE, SAID PHOTOCONDUCTING STRATUM HAVING A LONG BARK DECAY RELATIVE TO THE DARK DECAY OF SAID SUBSTRATUM, THE WEIGHT RATIO OF PHOTOCONDUCTING ZINC OXIDE TO VEHICLE IN SAID STRATUM BEING BETWEEN 50/50 AND 90/10, AND THE VEHICLE BEING PRESENT IN SAID SUBSTRATUM IN PROPORTIONS UP TO ONE PART BY WEIGHT VEHICLE TO TWO AND A HALF PARTS BY WEIGHT SEMICONDUCTING MATERIAL
References Cited (Backward Citations)
CA449303A
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US2297691A
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US2427700A
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US2476800A
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US2662957A
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US2761849A
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DE1022091B
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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) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |