Photographic element containing readily removable opaque protective layers
Abstract
Abstract READILY REMOVABLE OPAQUE COATINGS OVER ONE OR BOTH SIDES OF A PHOTOGRAPHIC OR RADIOGRAPHIC FILM, WHICH COATINGS CAN BE REMOVED IN A SINGLE PIECE, CAN BE MANUFACTURED BY APPLYING OVER THE FILM A MULTILAYER COATING COMPOSITION COMPRISING (A) A FIRST "BARRIER" LAYER CONTAINING ONE OR MORE WATER SOLUBLE POLYMERS THAT ARE COMPATIBLE WITH GELATIN AND THAT ADHERE TENACIOUSLY TO THE "OPAQUE" LAYER (B) AND (B) AN "OPAQUE" LAYER (OVER THE "BARRIER LAYER") COMPOSED OF A BLEND OF FINELY DIVIDED CARBON AND AT LEAST ONE WATER-INSOLUBLE POLYMER. THE "OPAQUE" LAYER MUST BE FAIRLY PERMEABLE TO WATER, SO THAT WHEN IS IS DESIRED TO REMOVE THE "OPAQUE" COATING, THE FILM CAN SIMPLY BE IMMERSED IN WATER. WITHIN A VERY SHORT TIME THE "OPAQUE" LAYER FALLS AWAY FROM THE FILM IN A SINGLE PIECE, RATHER THAN IN SMALL TROUBLESOME FLAKES.
Inventors
- 👤 John F Bishop
- 👤 Walker F Hunter Jr
- 👤 Martin E Rowley
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |