US2844574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyes and their method of
Assignee: —
•
Filing: 1953-06-03
•
Granted: 1958-07-22
•
Expires: 1973-06-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:29
CPC Classifications
C; C09; C09B; C09B39/00; G; G03; G03C; G03C7/00; G03C7/28; G03C7/29; Y; Y10; Y10S; Y10S534/00; Y10S534/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A POLYMERIC AZO DYE WHICH IS NON-DIFFUSING IN PHOTOGRAPHIC GELATIN COMPRISING A PLURALITY OF RADICALS EACH HAVING THE FORMULA
Claim 2
Dependent Claim
19 words
A POLYMERIC AZO DYE WHICH IS NON-DIFFUSING IN PHOTOGRAPHIC GELATIN COMPRISING A PLURALITY OF RADICALS EACH HAVING THE 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) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |