US3178296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic gelatino-silver halide emulsions containing polymeric addenda to increase covering power
Assignee: Eastman Kodak Co
•
Filing: 1961-07-27
•
Granted: 1965-04-13
•
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
2026-10-26 21:24
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PHOTOGRAPHIC GELATINO-SILVER HALIDE EMULSION CONTAINING ABOUT 15 TO 40 PERCENT BY WEIGHT BASED ON THE SAID GELATIN IN SAID EMULSION OF A POLYMERIC HYDROPHILIC COMPOSITION CONSISTING ESSENTIALLY OF A COPOLYMER OF ACRYLIC ACID AND AN N-SUBSTITUTED ACRYLAMIDE HAVING THE FORMULA R1-N(-R2)-CO-C(-R3)=CH2 WHEREIN R1 IS SELECTED FROM THE GROUP CONSISTING OF AN ALKYL RADICAL HAVING 1 TO 4 CARBON ATOMS AND A HYDROGEN ATOM, R2 IS AN ALKYL RADICAL HAVING 1 TO 4 CARBON ATOMS AND R3 IS SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM AND A METHYL RADICAL, EXCEPT THAT WHEN R1 IS A NORMAL-BUTYL RADICAL R2 IS AN ALKYL RADICAL HAVING 1 TO 4 CARBON ATOMS OTHER THAN A NORMAL-BUTYL RADICAL, SAID ACRYLIC ACID COMPRISING ABOUT 15 TO 90 PERCENT BY WEIGHT OF SAID COPOLYMER.
Claim 2
Dependent Claim
129 words
A PHOTOGRAPHIC GELATINO-SILVER HALIDE EMULSION CONTAINING ABOUT 15 TO 40 PERCENT BY WEIGHT BASED ON THE SAID GELATIN IN SAID EMULSION OF A POLYMERIC HYDROPHILIC COMPOSITION CONSISTING ESSENTIALLY OF A COPOLYMER OF ACRYLIC ACID AND AN N-SUBSTITUTED ACRYLAMIDE HAVING THE FORMULA R1-N(-R2)-CO-C(-R3)=CH2 WHEREIN R1 IS SELECTED FROM THE GROUP CONSISTING OF AN ALKYL RADICAL HAVING 1 TO 4 CARBON ATOMS AND A HYDROGEN ATOM, R2 IS AN ALKYL RADICAL HAVING 1 TO 4 CARBON ATOMS AND R3 IS SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM AND A METHYL RADICAL, EXCEPT THAT WHEN R1 IS A NORMAL-BUTYL RADICAL R2 IS AN ALKYL RADICAL HAVING 1 TO 4 CARBON ATOMS OTHER THAN A NORMAL-BUTYL RADICAL, SAID ACRYLIC ACID COMPRISING ABOUT 15 TO 90 PERCENT 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 |