US3181950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for optical bleaching of coated photosensitive papers and resultant product
Assignee: Gevaert Photo Producten NV
•
Filing: 1962-06-11
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Granted: 1965-05-04
•
Expires: 1982-06-11
Abstract
No abstract record available.
Inventors
- 👤 Koerber Willem Karel
- 👤 Schouteden Ferdinand Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:27
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/62; C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3445; C08K5/3447; C08K5/35; D21H19/52; D21H19/56; D21H19/60; D21H21/00; D21H21/14; D21H21/30; G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A LIGHT-SENSITIVE PHOTOGRAPHIC PAPER COMPRISING A PAPER SUPPORT, A WHITE PIGMENTED COATING ON A SURFACE OF SAID SUPPORT, AND A SUPERPOSED LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER, SAID EMULSION LAYER CONTAINING DISCRETE FLUORESCENT PARTICLES OBTAINED BY HEATING AN AQUEOUS SUSPENSION OF A FINELY-DIVIDED, WATER-SWELLABLE, WATERINSOLUBLE, UREA-FORMALDEHYDE RESIN, THROUGH WHICH SUSPENSION IS UNIFORMLY DISTRIBUTED AN OPTICAL BRIGHTENING AGENT SELECTED FROM THE GROUP CONSISTING OF: (1) 1,2-DI(5-METHYLBENZIMIDAZOLYL-2)-ETHYLENE, (2) 4,5-DIPHENYLIMIDAZOLONE-2.
Claim 2
Dependent Claim
66 words
A LIGHT-SENSITIVE PHOTOGRAPHIC PAPER COMPRISING A PAPER SUPPORT, A WHITE PIGMENTED COATING ON A SURFACE OF SAID SUPPORT, AND A SUPERPOSED LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER, SAID EMULSION LAYER CONTAINING DISCRETE FLUORESCENT PARTICLES OBTAINED BY HEATING AN AQUEOUS SUSPENSION OF A FINELY-DIVIDED, WATER-SWELLABLE, WATERINSOLUBLE, UREA-FORMALDEHYDE RESIN, THROUGH WHICH SUSPENSION IS UNIFORMLY DISTRIBUTED AN OPTICAL BRIGHTENING AGENT SELECTED FROM THE GROUP CONSISTING OF: (1) 1,2-DI(5-METHYLBENZIMIDAZOLYL-2)-ETHYLENE, (2) 4,5-DIPHENYLIMIDAZOLONE-2.
References Cited (Backward Citations)
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US2762719A
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US2723197A
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US2873206A
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FR1239314A
Cited
US3047390A
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US2851424A
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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) | 1968-05-03 | 1968-11-02 | 1969-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-03 | 1972-11-02 | 1973-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-03 | 1976-11-02 | 1977-05-04 | $7700.00 | Window Closed / Lapsed |