US3205484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic memory system
Assignee: Xerox Corp
•
Filing: 1961-10-19
•
Granted: 1965-09-07
•
Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Schwertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:43
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; H; H04; H04N; H04N1/00; H04N1/23; H04N1/29; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
AN ELECTROSTATIC MEMORY DEVICE COMPRISING A ROTARY DRUM HAVING A LAYER OF PHOTOCONDUCTIVE MATERIAL COATED THEREON, A PLURALITY OF RELATIVELY BROAD ELECTRODES EACH HAVING A RELATIVELY SHARP EDGE DISPOSED IN PROXIMITY TO THE PERIPHERY OF SAID DRUM, SAID ELEMENTS BEING ARRANGED CIRCUMFERENTIALLY WITH RESPECT TO SAID DRUM IN STAGGERED RELATION AHD HAVING THEIR EDGES LYING IN PARALLEL TO THE LONGITUDINAL AXIS OF TH DRUM SO THAT EACH COVERS A SEPARATE AREA OF SAID DRUM SURFACE, RECORIDNG MEANS TO APPLY PULSED INFORMATION TO SAID ELECTRODES TO FORM CIRCUMFERENTIAL TRACKS ON SAID LAYER HAVING SMALL DISCRETE CHARGED
Claim 2
Dependent Claim
95 words
AN ELECTROSTATIC MEMORY DEVICE COMPRISING A ROTARY DRUM HAVING A LAYER OF PHOTOCONDUCTIVE MATERIAL COATED THEREON, A PLURALITY OF RELATIVELY BROAD ELECTRODES EACH HAVING A RELATIVELY SHARP EDGE DISPOSED IN PROXIMITY TO THE PERIPHERY OF SAID DRUM, SAID ELEMENTS BEING ARRANGED CIRCUMFERENTIALLY WITH RESPECT TO SAID DRUM IN STAGGERED RELATION AHD HAVING THEIR EDGES LYING IN PARALLEL TO THE LONGITUDINAL AXIS OF TH DRUM SO THAT EACH COVERS A SEPARATE AREA OF SAID DRUM SURFACE, RECORIDNG MEANS TO APPLY PULSED INFORMATION TO SAID ELECTRODES TO FORM CIRCUMFERENTIAL TRACKS ON SAID LAYER HAVING SMALL DISCRETE CHARGED
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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) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |