US3178295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsions fog stabilized with copolymers of n, n-di-normal-butylacrylamide and acrylic acid
Assignee: Eastman Kodak Co
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Filing: 1961-07-27
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Granted: 1965-04-13
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Expires: 1981-07-27
Abstract
No abstract record available.
Inventors
- 👤 Louis M Minsk
- 👤 David P Brust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:56
CPC Classifications
H; H02; H02H; H02H5/00; H02H5/04; H02H5/06; B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0041; B64C29/0066; C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; G; G03; G03C; G03C1/00; G03C1/005; G03C1/035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PHOTOGRAPHIC GELATINO-SILVER HALIDE EMULSION CONTAINING ABOUT 5 TO 40 PERCENT BY WEIGHT BASED ON THE SAID GELATIN IN SAID EMULSION OF A POLYMERIC HYDROPHILIC COMPOSITION CONSISTING ESSENTIALLY OF A COPOLYMER OF N,NDI-NORMAL-BUTYLACRYLAMIDE AND ACRYLIC ACID WHEREIN THE ACRYLIC ACID COMPRISES ABOUT 15 TO 50 LPERCENT BY WEIGHT OF SAID COPOLYMER.
Claim 2
Dependent Claim
51 words
A PHOTOGRAPHIC GELATINO-SILVER HALIDE EMULSION CONTAINING ABOUT 5 TO 40 PERCENT BY WEIGHT BASED ON THE SAID GELATIN IN SAID EMULSION OF A POLYMERIC HYDROPHILIC COMPOSITION CONSISTING ESSENTIALLY OF A COPOLYMER OF N,NDI-NORMAL-BUTYLACRYLAMIDE AND ACRYLIC ACID WHEREIN THE ACRYLIC ACID COMPRISES ABOUT 15 TO 50 LPERCENT BY WEIGHT OF SAID COPOLYMER.
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |