US3140945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing
Assignee: Australian Government
•
Filing: 1960-06-08
•
Granted: 1964-07-14
•
Expires: 1980-06-08
Abstract
No abstract record available.
Inventors
- 👤 Metcalfe Kenneth Archibald
- 👤 Wright Robert John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
AN ELECTROSTATIC REPRODUCTION METHOD COMPRISING FORMING, ON A SURFACE ADAPTED TO RECIEVE AN ELECTROSTATIC CHARGE, AN ELECTROSTATIC IMAGE CONSTITUTED BY THE SELECTIVE POSITIONING OF ELECTROSTATIC CHARGES, AND PRESERVING SAID IMAGE BY SURROUNDING THE SAME ON SAID SURFACE WITH AN ENCLOSURE OF A SUBSTANTIALLY UNIFORM ELECTROSTATIC CHARGE ADAPTED TO REPELL THE FIRST SAID CHARGES AND THUS PREVENT THE LATTER FROM LEAKING FROM SAID SURFACE, SAID ENCLOSURE HAVING AN AREA OF AT LEAST ABOUT ONE-HALF THE AREA WHICH IS ENCLOSED.
Claim 2
Dependent Claim
78 words
AN ELECTROSTATIC REPRODUCTION METHOD COMPRISING FORMING, ON A SURFACE ADAPTED TO RECIEVE AN ELECTROSTATIC CHARGE, AN ELECTROSTATIC IMAGE CONSTITUTED BY THE SELECTIVE POSITIONING OF ELECTROSTATIC CHARGES, AND PRESERVING SAID IMAGE BY SURROUNDING THE SAME ON SAID SURFACE WITH AN ENCLOSURE OF A SUBSTANTIALLY UNIFORM ELECTROSTATIC CHARGE ADAPTED TO REPELL THE FIRST SAID CHARGES AND THUS PREVENT THE LATTER FROM LEAKING FROM SAID SURFACE, SAID ENCLOSURE HAVING AN AREA OF AT LEAST ABOUT ONE-HALF THE AREA WHICH IS ENCLOSED.
Claim 3
Dependent Claim
64 words
A METHOD AS CLAIMED IN CLAIM 1 WHEREIN SAID SURFACE IS THE SURFACE OF PHOTOCONDUCTOR SHEET, COMPRISING UNIFORMLY CHARGING SAID SURFACE PREPARATORY TO GENERATING AN ELECTOSTATIC IMAGE AND PHOTOGRAPHICALLY BLEEDING AWAY THE UNIFORM CHARGE IN SELECTIVE MANNER TO FORM THE IMAGE WHILE SHIELDING A PORTION OF THE SURFACE ENCIRCLING THE IMAGE TO RETAIN THE UNIFORM CHARGE IN SAID PORTION TO CREATE AN ELECTROSTASTIC FENCE.
References Cited (Backward Citations)
GB326200A
Cited
US1817606A
Cited
US2295000A
Cited
US2277013A
Cited
US2693416A
Cited
US2803177A
Cited
US3009402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |