US3000735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the reproduction of images
Assignee: DANIEL FRANKLIN KELLER
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Filing: 1956-06-11
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Granted: 1961-09-19
•
Expires: 1976-06-11
Abstract
No abstract record available.
Inventors
- 👤 Harry E Gunning
- 👤 Keller Daniel Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/056; G03G15/22; G03G15/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE METHOD OF ELECTROPHOTOGRAPHICALLY PRODUCING AN ELECTROSTATIC IMAGE WHICH INCLUDES THE STEPS OF (1) BRINGING INTO CONFRONTING PROXIMATE ADJACENCY TWO LAYERS OF SUBSTANTIALLY COEXTENSIVE AREA INCLUDING A FIRST PHOTOCONDUCTIVE INSULATING LAYER AND A SECOND LAYER FORMED FROM AN ELECTROSTATICALLY VOLUME-POLARIZED ELECTRET MATERIAL POSSESSING PERMANENT ELECTROSTIC FIELDS OF OPPOSITE POLARITIES AT OPPOSED SURFACES THEREOF, (2) INDUCING AN ELECTROSTATIC CHARGE ON THE PHOTOCONDUCTIVE LAYER WITH SAID ELECTRET MATERIAL AND (3) WHILE SAID PHOTOCONDUCTIVE INSULATING LAYER IS GROUNDED, PROJECTING RADIATION ON SAID PHOTOCONDUCTIVE INSULATING LAYER IN AN IMAGE TO BE REPRODUCED BY EXPOSURE TO LIGHT, SAID STEPS BEING PERFORMED SEQUENTIALLY IN THE ORDER NAMED.
Claim 2
Independent Claim
101 words
THE METHOD OF ELECTROPHOTOGRAPHICALLY PRODUCING AN ELECTROSTATIC IMAGE WHICH INCLUDES THE STEPS OF (1) BRINGING INTO CONFRONTING PROXIMATE ADJACENCY TWO LAYERS OF SUBSTANTIALLY COEXTENSIVE AREA INCLUDING A FIRST PHOTOCONDUCTIVE INSULATING LAYER AND A SECOND LAYER FORMED FROM AN ELECTROSTATICALLY VOLUME-POLARIZED ELECTRET MATERIAL POSSESSING PERMANENT ELECTROSTIC FIELDS OF OPPOSITE POLARITIES AT OPPOSED SURFACES THEREOF, (2) INDUCING AN ELECTROSTATIC CHARGE ON THE PHOTOCONDUCTIVE LAYER WITH SAID ELECTRET MATERIAL AND (3) WHILE SAID PHOTOCONDUCTIVE INSULATING LAYER IS GROUNDED, PROJECTING RADIATION ON SAID PHOTOCONDUCTIVE INSULATING LAYER IN AN IMAGE TO BE REPRODUCED BY EXPOSURE TO LIGHT, SAID STEPS BEING PERFORMED SEQUENTIALLY IN THE ORDER NAMED.
References Cited (Backward Citations)
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Cited
US2297691A
Cited
US2551582A
Cited
US2695363A
Cited
US2777957A
Cited
US2693416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |