US3681072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent laminate photographic film
Assignee: Polaroid Corp
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Filing: 1969-12-31
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Granted: 1972-08-01
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Expires: 1989-12-31
Abstract
Abstract THE PRESENT INVENTION IS DIRECTED TO A PHOTOGRAPHIC FILM UNIT WHICH COMPRISES A PERMANENT LAMINATE INCLUDING A SUPPORT CARRYING ON ONE SURFACE PHOTOSENSITIVE SILVER HALIDE CRYSTALS AND SILVER PRECIPITATING NUCLEI AND A LAYER COMPRISING SILVER PRECIPITATING NUCLEI; AND PROCESSES EMPLOYING SAID FILM UNIT.
Inventors
- 👤 Frank E Debruyn Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:36
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/30
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |