Patent US1682407A successfully refreshed from Google Patents.
Patent US2690394A successfully refreshed from Google Patents.
US2690394A
Expired / Lapsed
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Electrophotography
Assignee: Individual
•
Filing: 1950-06-06
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Granted: 1954-09-28
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Expires: 1970-06-06
Abstract
No abstract record available.
Inventors
- 👤 Chester F Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:16
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/16; G03G15/00; G03G15/06; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN ELECTROPHOTOGRAPHIC APPARATUS, THE COMBINATION WITH AN ELECTROPHOTOGRAPHIC PLATE CONSISTING OF A CONDUCTIVE BASE AND A LAYER OF PHOTOCONDUCTIVE INSULATING MATERIAL SUPPORTED BY SAID BASE AND IN CONTACT THEREWITH THROUGHOUT AN IMAGE AREA, OF A CONDUCTIVE ELECTRODE IN SPACED PARALLEL RELATION TO THE FACE OF SAID LAYER IN SAID IMAGE AREA, MEANS TO INTRODUCE CHARGED PARTICLES BETWEEN SAID LAYER AND SAID ELECTRODE TO DEVELOP SAID ELECTROSTATIC LATENT IMAGE, AND A POTENTIAL SOURCE CONNECTED BETWEEN SAID CONDUCTIVE BASE AND SAID ELECTRODE.
Claim 2
Dependent Claim
80 words
IN ELECTROPHOTOGRAPHIC APPARATUS, THE COMBINATION WITH AN ELECTROPHOTOGRAPHIC PLATE CONSISTING OF A CONDUCTIVE BASE AND A LAYER OF PHOTOCONDUCTIVE INSULATING MATERIAL SUPPORTED BY SAID BASE AND IN CONTACT THEREWITH THROUGHOUT AN IMAGE AREA, OF A CONDUCTIVE ELECTRODE IN SPACED PARALLEL RELATION TO THE FACE OF SAID LAYER IN SAID IMAGE AREA, MEANS TO INTRODUCE CHARGED PARTICLES BETWEEN SAID LAYER AND SAID ELECTRODE TO DEVELOP SAID ELECTROSTATIC LATENT IMAGE, AND A POTENTIAL SOURCE CONNECTED BETWEEN SAID CONDUCTIVE BASE AND SAID ELECTRODE.
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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) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |