Patent US2492954A successfully refreshed from Google Patents.
US2492954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic four-color light-sensitive stripping elements
Assignee: EIDP Inc
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Filing: 1947-12-24
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Granted: 1950-01-03
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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
2026-10-31 02:22
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A MULITILAYER PHOTOGRAPHIC ELEMENT COMPRISING A TRANSPARENT FILM BASE HAVING SUPERPOSED THEREON IN ORDER A HYDROPHILIC COLLOID SILVER HALIDE EMULSIOIN LAYER WHICH HAS AN EXTRA BAND OF SENSITIVITY IN THE RED REGION OF THE SPECTRUM WITH A MAXIMUM SENSITIVITY AT A POSITION WITHIN THE RANGE FROM 605 TO 670 MILLIMICRONS, A STRIPPING SEPARATOR LAYER COMPOSED OF A DEVELOPER-INSOLUBLE, WATER-SOLUBLE COLLOID CONTAINING A LIGHT-FILTER DYE FOR THE AFORESAID FIRST LAYER, A HYDROPHILIC COLLOID LAYER HALIDE EMULSION LAYER WHICH HAS AN EXTRA BAND OF SENSITIVITY IN THE YELLOW REGION OF THE SPECTRUM WITH A MAXIMUM SENSITIVITY AT A POSITION WITHIN THE RANGE 545 TO 575 MILLIMICRONS, A STRIPPING LAYER COMPOSED OF A DEVELOPER-INSOLUBLE, WATER-SOLUBLE COLLOID CONTAINING A FILTER DYE
Claim 2
Dependent Claim
117 words
A MULITILAYER PHOTOGRAPHIC ELEMENT COMPRISING A TRANSPARENT FILM BASE HAVING SUPERPOSED THEREON IN ORDER A HYDROPHILIC COLLOID SILVER HALIDE EMULSIOIN LAYER WHICH HAS AN EXTRA BAND OF SENSITIVITY IN THE RED REGION OF THE SPECTRUM WITH A MAXIMUM SENSITIVITY AT A POSITION WITHIN THE RANGE FROM 605 TO 670 MILLIMICRONS, A STRIPPING SEPARATOR LAYER COMPOSED OF A DEVELOPER-INSOLUBLE, WATER-SOLUBLE COLLOID CONTAINING A LIGHT-FILTER DYE FOR THE AFORESAID FIRST LAYER, A HYDROPHILIC COLLOID LAYER HALIDE EMULSION LAYER WHICH HAS AN EXTRA BAND OF SENSITIVITY IN THE YELLOW REGION OF THE SPECTRUM WITH A MAXIMUM SENSITIVITY AT A POSITION WITHIN THE RANGE 545 TO 575 MILLIMICRONS, A STRIPPING LAYER COMPOSED OF A DEVELOPER-INSOLUBLE, WATER-SOLUBLE COLLOID CONTAINING A FILTER DYE
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 |