Patent US2900280A successfully refreshed from Google Patents.
US2900280A
Expired / Lapsed
US
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Formation of layers of photo-conductive materials
Assignee: EMI Ltd
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Filing: 1956-07-16
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Granted: 1959-08-18
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Expires: 1976-07-16
Abstract
No abstract record available.
Inventors
- 👤 Lubszynski Hans Gerhard
- 👤 Wardley John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:16
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A METHOD OF FORMING A COMPOSITE LAYER OF PHOTOCONDUCTIVE MATERIAL ON THE SURFACE OF A SUPPORT COMPRISING EVAPORATING SAID MATERIAL ON SAID SURFACE BY EVAPORATION OF SAID MATERIAL IN A GAS ATMOSPHERE TO FORM A SPONGY LAYER ON SAID SURFACE HEATING SAID LAYER AFTER DEPOSITION THEREOF TO SUCH A TEMPERATURE AND FOR SUCH A PERIOD OF TIME TO INCREASE THE SENSITIVITY OF SAID LAYER, AND THEN EVAPORATING A LAYER OF A PHOTO-CONDUCTIVE MATERIAL IN VACUO SO AS TO PROVIDE A SOLID LAYER ON SAID SPONGY LAYER.
Claim 2
Independent Claim
86 words
A METHOD OF FORMING A COMPOSITE LAYER OF PHOTOCONDUCTIVE MATERIAL ON THE SURFACE OF A SUPPORT COMPRISING EVAPORATING SAID MATERIAL ON SAID SURFACE BY EVAPORATION OF SAID MATERIAL IN A GAS ATMOSPHERE TO FORM A SPONGY LAYER ON SAID SURFACE HEATING SAID LAYER AFTER DEPOSITION THEREOF TO SUCH A TEMPERATURE AND FOR SUCH A PERIOD OF TIME TO INCREASE THE SENSITIVITY OF SAID LAYER, AND THEN EVAPORATING A LAYER OF A PHOTO-CONDUCTIVE MATERIAL IN VACUO SO AS TO PROVIDE A SOLID LAYER ON SAID SPONGY LAYER.
References Cited (Backward Citations)
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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) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |