US2944898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensitization of photographic emulsions
Assignee: Eastman Kodak Co
•
Filing: 1957-11-27
•
Granted: 1960-07-12
•
Expires: 1977-11-27
Abstract
No abstract record available.
Inventors
- 👤 Dorothy J Beavers
- 👤 Charles V Wilson
- 👤 James L Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:25
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/16; C07D213/20; C07C; C07C243/00; C07D213/24; C07D213/28; C07D213/30; C07D213/60; C07D213/72; C07D213/75; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING A QUATERNARY AMMONIUM SALT HAVING A GENERAL FORMULA OF THE CLASS CONSISTING OF
Claim 2
Dependent Claim
19 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING A QUATERNARY AMMONIUM SALT HAVING A GENERAL FORMULA OF THE CLASS CONSISTING OF
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) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |