US2819165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antifading layers for photographic black and white materials
Assignee: GAF Chemicals Corp
•
Filing: 1953-02-20
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Granted: 1958-01-07
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Expires: 1973-02-20
Abstract
No abstract record available.
Inventors
- 👤 Mackey E Scudder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:20
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/76; G03C1/7614; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT AND A LIGHT-SENSITIVE SILVER HALIDE EMULSION CAPABLE OF BEING DEVELOPED INTO A SILVER IMAGE HAVING A WARM IMAGE TONE, SAID EMULSION PROVIDED WITH A COLLOIDAL SURFACE COATING COMPRISING A COLLOIDAL CARRIER HAVING DISPERSED THEREIN, AN ANTIFADING AMOUNT OF A WATER SOLUBLE, AMORPHOUS RESINOUS ADDITION PRODUCT OF FORMALDEHYDE AND A UREA HAVING A MEDIAN DEGREE OF POLYMERIZATION RANGING FROM ABOUT 8 TO 30, SAID UREA BEING SELECTED FROM THE CLASS CONSISTING OF THOSE HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
82 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT AND A LIGHT-SENSITIVE SILVER HALIDE EMULSION CAPABLE OF BEING DEVELOPED INTO A SILVER IMAGE HAVING A WARM IMAGE TONE, SAID EMULSION PROVIDED WITH A COLLOIDAL SURFACE COATING COMPRISING A COLLOIDAL CARRIER HAVING DISPERSED THEREIN, AN ANTIFADING AMOUNT OF A WATER SOLUBLE, AMORPHOUS RESINOUS ADDITION PRODUCT OF FORMALDEHYDE AND A UREA HAVING A MEDIAN DEGREE OF POLYMERIZATION RANGING FROM ABOUT 8 TO 30, SAID UREA BEING SELECTED FROM THE CLASS CONSISTING OF THOSE HAVING THE FOLLOWING FORMULA:
References Cited (Backward Citations)
US2338664A
Cited
FR896036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |