Patent US2835581A successfully refreshed from Google Patents.
US2835581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrazaindenes and photographic emulsions containing them
Assignee: Eastman Kodak Co
•
Filing: 1955-06-15
•
Granted: 1958-05-20
•
Expires: 1975-06-15
Abstract
No abstract record available.
Inventors
- 👤 John F Tinker
- 👤 Jr John Sagal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:20
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; C07D249/00; C07D249/02; C07D249/08; C07D249/10; C07D249/14; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING A COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
17 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING A COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
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) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |