Patent US2886437A successfully refreshed from Google Patents.
US2886437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions sensitized with alkylene oxide polymers and quaternary ammonium compounds
Assignee: Eastman Kodak Co
•
Filing: 1955-12-01
•
Granted: 1959-05-12
•
Expires: 1975-12-01
Abstract
No abstract record available.
Inventors
- 👤 Douglas E Piper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:53
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/04; G03C1/043; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
THE METHOD OF INCREASING THE SENSITIVITY OF A SILVER HALIDE EMULSION, WHICH COMPRISES EXPOSING SAID EMULSION AND DEVELOPING IT IN THE PRESENCE OF AN ALKYLENE OXIDE POLYMER SELECTED FROM THE CLASS CONSISTING OF (1) POLYALKYLENE GLYCOLS AND (2) CONDENSATION PRODUCTS OF ALKYLENE OXIDE WITH ORGANIC COMPOUNDS CONTAINING AN ACTIVE HYDROGEN ATOM, SAID ALKYLENE OXIDE CONTAINING FROM 2 TO 4 CARBON ATOMS AND SAID ALKYLENE OXIDE POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 300, AND A BIS-QUATERNARY AMMONIUM SALT SILVER HALIDE SENSITIZING AGENT, THE QUATERNARY AMMONIUM GROUPS OF WHICH ARE LINKED TOGETHER BY A CHAIN OF AT LEAST SEVEN ATOMS.
Claim 2
Independent Claim
100 words
THE METHOD OF INCREASING THE SENSITIVITY OF A SILVER HALIDE EMULSION, WHICH COMPRISES EXPOSING SAID EMULSION AND DEVELOPING IT IN THE PRESENCE OF AN ALKYLENE OXIDE POLYMER SELECTED FROM THE CLASS CONSISTING OF (1) POLYALKYLENE GLYCOLS AND (2) CONDENSATION PRODUCTS OF ALKYLENE OXIDE WITH ORGANIC COMPOUNDS CONTAINING AN ACTIVE HYDROGEN ATOM, SAID ALKYLENE OXIDE CONTAINING FROM 2 TO 4 CARBON ATOMS AND SAID ALKYLENE OXIDE POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 300, AND A BIS-QUATERNARY AMMONIUM SALT SILVER HALIDE SENSITIZING AGENT, THE QUATERNARY AMMONIUM GROUPS OF WHICH ARE LINKED TOGETHER BY A CHAIN OF AT LEAST SEVEN ATOMS.
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) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |