US3587425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply for a photographic camera
Assignee: Polaroid Corp
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Filing: 1969-12-18
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Granted: 1971-06-28
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Expires: 1989-12-18
Abstract
Abstract AN ELECTRICAL POWER SUPPLY FOR A PHOTOGRAPHIC CAMERA AND ITS ACCESSORIES. CURRENT DEMANDS OF THE PHOTOGRAPHIC SYSTEM ARE MET BY A SECONDARY CELL MOUNTED WITHIN THE BASIC CAMERA STRUCTURE. THE SECONDARY CELL IS RECHARGEABLE DURING A PICTURE TAKING SEQUENCE BY A PRIMARY BATTERY INCORPORATED WITH A DISPOSABLE FILM CASSETTE. FOLLOWING THE EXHAUSTION OF FILM WITHIN THE CASSETTE, BOTH THE EMPTY CASSETTE AND THE PRIMARY RECHARGING BATTERY ARE DISPOSED OF. A DIODE OR THE LIKE IS INSERTED WITHIN THE INTERCONNECTING CIRCUITRY OF THE BATTERIES IN ORDER TO PREVENT A BACKDRAIN OF CHARGE FROM THE SECONDARY BATTERY.
Inventors
- 👤 Conrad H Biber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:01
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/48; G03B17/50; G03B17/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |