Patent US3682639A successfully refreshed from Google Patents.
US3682639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic paper with polyolefin coating
Assignee: Individual
•
Filing: 1971-01-22
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Granted: 1972-08-08
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Expires: 1991-01-22
Abstract
Abstract IMPROVED PHOTOGRAPHIC PAPERS HAVING A POLYOLEFIN COATED PAPER BASE ARE DISCLOSED. IT HAS BEEN FOUND THAT PHOTOSENSITIVE EMULSIONS PERFORM BETTER WHEN THEY ARE COATED DIRECTLY UPON A LAYER OF CELLULOSE ESTER SUCH AS CELLUOSE ACETATE. IMPROVED ADHESION OF SUCH A 2-LAYER COATING TO POLYOLEFIN COATED PAPER RESULTS WHEN A LAYER OF CHLORINATED POLYOLEFIN IS UTILIZED AS A "SUB" BETWEEN THE POLYOLEFIN COATING (ON THE PAPER) AND THE CELLULOSE ESTER COATING (UNDER THE EMULSION).
Inventors
- 👤 Herbert Stephen Barbehenn
- 👤 James Michael Irizarry
- 👤 Gerald Martin Leszyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:47
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/79
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |