US3589904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic film unit
Assignee: Polaroid Corp
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Filing: 1969-08-19
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Granted: 1971-06-29
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Expires: 1989-08-19
Abstract
Abstract A SELF-DEVELOPING PHOTOGRAPHIC FILM UNIT ADAPTED TO BE PROCESSED BY BEING MOVED BETWEEN TWO PRESSURE-APPLYING ROLLERS. A TRANSPARENT SHEET IS HELD IN FACE-TO-FACE CONTACT WITH THE PHOTOSENSITIVE SHEET WITH A LIQUID PROCESSING COMPOSITION BEING FED BETWEEN THE SHEETS AND ARRANGED SO THAT EXCESS PROCESSING LIQUID IS COLLECTED AFTER THE PHOTOSENSITIVE SHEET HAS BEEN COVERED AND ANY AIR TRAPPED WITH THE PROCESSING LIQUID IS ALLOWED TO ESCAPE. THE ESCAPE MEANS PROVIDED IS AN UNSEALED PORTION OF A FOLD IN THE BINDING MATERIAL THAT HOLDS THE SHEETS TOGETHER.
Inventors
- 👤 Richard J Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:33
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/44; G03B; G03B17/00; G03B17/28; G03B17/32; G03B17/34
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |