Patent US5263157A successfully refreshed from Google Patents.
Patent US2492952A successfully refreshed from Google Patents.
US2492952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic four-color light-sensitive stripping elements
Assignee: EIDP Inc
•
Filing: 1947-12-24
•
Granted: 1950-01-03
•
Expires: 1967-12-24
Abstract
No abstract record available.
Inventors
- 👤 Ball Joseph Arthur
- 👤 Jennings Andrew Bradshaw
- 👤 Murray Otis Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:01
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A COMPOSITE PAIR OF FILM ELEMENTS COMPRISING A FILM BASE HAVING SUPERPOSED THEREON IN ORDER A WATER-PERMEABLE COLLOID SILVER HALIDE EMULSION LAYER WHICH HAS AN EXTRA BAND OF SENSITIVITY IN THE RED REGION OF THE SPECTRUM WITH A MAXIMUM AT A POSITION WITHIN THE RANGE FROM 605 TO 670 MILLIMICRONS, A STRIPPING SEPARATOR LAYER COMPOSED OF A DEVELOPER-INSOLUBLE, WATERSOLUBLE COLLOID AND A WATER-PERMEABLE COLLOID SILVER HALIDE EMULSION LAYER HAVING A BAND OF EXTRA SENSITIVITY IN THE GREEN REGION OF THE SPECTRUM WITH A MAXIMUM AT A POSITION BETWEEN 490 AND 535 MILLIMICRONS, AND A FILM BASE HAVING SUPERPOSED THEREON IN ORDER A WATER-PERMEABLE COLLOID SILVER HALIDE EMULSION LAYER HAVING A BAND OF EXTRA SENSITIVITY IN THE YELLOW REGION OF THE SPECTRUM WITH A MAXIMUM AT A POSITION WITHIN THE RANGE FROM 545 TO 575 MILLIMICRONS, A STRIPPING SEPARATOR LAYER COMPOSED OF DEVELOPER-INSOLUBLE, WATER-SOLUBLE COLLOID CONTAINING A YELLOW-ORANGE FILTERING MATERIAL WHICH ABSORBS LIGHT SHORTER THAN 540 MILLIMICRONS AND PASSES LONGER WAVELENGTHS AND AN OUTER WATER-PERMEABLE COLLOID SILVER HALIDE EMULSION LAYER SENSITIVE TO BLUE LIGHT ONLY.
Claim 2
Dependent Claim
174 words
A COMPOSITE PAIR OF FILM ELEMENTS COMPRISING A FILM BASE HAVING SUPERPOSED THEREON IN ORDER A WATER-PERMEABLE COLLOID SILVER HALIDE EMULSION LAYER WHICH HAS AN EXTRA BAND OF SENSITIVITY IN THE RED REGION OF THE SPECTRUM WITH A MAXIMUM AT A POSITION WITHIN THE RANGE FROM 605 TO 670 MILLIMICRONS, A STRIPPING SEPARATOR LAYER COMPOSED OF A DEVELOPER-INSOLUBLE, WATERSOLUBLE COLLOID AND A WATER-PERMEABLE COLLOID SILVER HALIDE EMULSION LAYER HAVING A BAND OF EXTRA SENSITIVITY IN THE GREEN REGION OF THE SPECTRUM WITH A MAXIMUM AT A POSITION BETWEEN 490 AND 535 MILLIMICRONS, AND A FILM BASE HAVING SUPERPOSED THEREON IN ORDER A WATER-PERMEABLE COLLOID SILVER HALIDE EMULSION LAYER HAVING A BAND OF EXTRA SENSITIVITY IN THE YELLOW REGION OF THE SPECTRUM WITH A MAXIMUM AT A POSITION WITHIN THE RANGE FROM 545 TO 575 MILLIMICRONS, A STRIPPING SEPARATOR LAYER COMPOSED OF DEVELOPER-INSOLUBLE, WATER-SOLUBLE COLLOID CONTAINING A YELLOW-ORANGE FILTERING MATERIAL WHICH ABSORBS LIGHT SHORTER THAN 540 MILLIMICRONS AND PASSES LONGER WAVELENGTHS AND AN OUTER WATER-PERMEABLE COLLOID SILVER HALIDE EMULSION LAYER SENSITIVE TO BLUE LIGHT ONLY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |