US3345944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplication of electrostatic printing
Assignee: Unisys Corp
•
Filing: 1961-06-30
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Granted: 1967-10-10
•
Expires: 1981-06-30
Abstract
No abstract record available.
Inventors
- 👤 Charles A Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:22
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09775; G03G15/00; G03G15/22; G03G7/00; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A METHOD OF MAKING COPIES CORRESPONDING TO INPUT INFORMATION PROVIDED BY AN ELECTROSTATIC RECORDING PROCESS COMPRISING, ELECTROSTATICALLY CHARGING AREAS CORRESPONDING TO A MESSAGE ON A DIELECTRIC-COATED, CONDUCTIVE BACKING MASTER MEDIUM, APPLYING NEUTRAL CONDUCTIVE DRY INK PARTICLES TO SAID CHARGES, THEN ON COMPLETION OF SAID INK APPLYING STEP, POSITIONING SAID MASTER INKED UPON SURFACE IN FACING SLIGHTLY SEPARATED RELATIONSHIP TO A FIRST ELECTRODE OF AN ALIGNED PAIR OF ELECTRODES WITH THE MEDIUM SIDE OPPOSITE THE INKED SIDE DISPOSED CONTIGUOUS TO THE SECOND ELECTRODE OF THE PAIR AND SIMULTANEOUSLY APPLYING AN ELECTRIC FIELD OF A VOLTAGE OF THE ORDER OF 700 TO 1500 VOLTS APPROXIMATELY TO SAID MASTER MEDIUM IN A DIRECTION TO ERASE INK CLINGING TO SAID MASTER MEDIUM DUE TO BACKGROUND NOISE CHARGES AND TO ERASE INK ACCUMULATED DUE TO CHARGES INDUCED ON THE FRINGE OF SAID INFORMATION BOUNDARIES WHILE RETAINING SAID MESSAGE INK ON
Claim 2
Independent Claim
145 words
A METHOD OF MAKING COPIES CORRESPONDING TO INPUT INFORMATION PROVIDED BY AN ELECTROSTATIC RECORDING PROCESS COMPRISING, ELECTROSTATICALLY CHARGING AREAS CORRESPONDING TO A MESSAGE ON A DIELECTRIC-COATED, CONDUCTIVE BACKING MASTER MEDIUM, APPLYING NEUTRAL CONDUCTIVE DRY INK PARTICLES TO SAID CHARGES, THEN ON COMPLETION OF SAID INK APPLYING STEP, POSITIONING SAID MASTER INKED UPON SURFACE IN FACING SLIGHTLY SEPARATED RELATIONSHIP TO A FIRST ELECTRODE OF AN ALIGNED PAIR OF ELECTRODES WITH THE MEDIUM SIDE OPPOSITE THE INKED SIDE DISPOSED CONTIGUOUS TO THE SECOND ELECTRODE OF THE PAIR AND SIMULTANEOUSLY APPLYING AN ELECTRIC FIELD OF A VOLTAGE OF THE ORDER OF 700 TO 1500 VOLTS APPROXIMATELY TO SAID MASTER MEDIUM IN A DIRECTION TO ERASE INK CLINGING TO SAID MASTER MEDIUM DUE TO BACKGROUND NOISE CHARGES AND TO ERASE INK ACCUMULATED DUE TO CHARGES INDUCED ON THE FRINGE OF SAID INFORMATION BOUNDARIES WHILE RETAINING SAID MESSAGE INK ON
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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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |