Patent US4307071A successfully refreshed from Google Patents.
US3606532A
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Photoelectrostatic duplicator
Assignee: AB Dick Co
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Filing: 1969-01-21
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Granted: 1971-09-20
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Expires: 1989-01-21
Abstract
Abstract AN AUTOMATIC PHOTOELECTROSTATIC COPIER DUPLICATOR CAPABLE OF MAKING REPRODUCTIONS ON PLAIN PAPER USING ELECTROSTATIC PRINTING TECHNIQUES. THE APPARATUS IS EQUIPPED WITH A PHOTOCONDUCTIVE MEDIUM FORMED INTO A CONTINUOUS BELT WHICH CARRIES A TRANSFERABLE POWDER IMAGE AND WHICH IMAGE IS TRANSFERRED TO A RECEIVING SHEET OF PLAIN PAPER FED FROM A SUPPLY TO A TRANSFER STATION IN TIMED RELATION WITH THE ARRIVAL THEREAT OF THE TRANSFERABLE POWDER IMAGE. THE BELT IS PROVIDED WITH A MARKER WHICH IS RECOGNIZED BY SENSING DEVICES WHICH ARE PART OF AN ELECTRICAL CONTROL SYSTEM.
Inventors
- 👤 Loren E Shelffo
- 👤 Henry A Mathisen
- 👤 Frank L Schwager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/225; G03G15/26; G03G15/263; G03G21/00; G03G21/14; G03G21/145; H; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/50; H03F3/00; H03F3/02; H03F3/50; H03F3/52; H04; H04N; H04N5/00; H04N5/44; H04N5/4446
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |