US2536398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrazolone diazotype couplers
Assignee: GAF Chemicals Corp
•
Filing: 1947-10-10
•
Granted: 1951-01-02
•
Expires: 1967-10-10
Abstract
No abstract record available.
Inventors
- 👤 Sam C Slifkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:50
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A DIAZOTYPE PHOTO-REPRODUCTION MATERIAL COMPRISING A LIGHT-SENSITIVE LAYER ON A SUITABLE BASE CONTAINING AS THE AZO DYE COUPLING COMPONENT A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
24 words
A DIAZOTYPE PHOTO-REPRODUCTION MATERIAL COMPRISING A LIGHT-SENSITIVE LAYER ON A SUITABLE BASE CONTAINING AS THE AZO DYE COUPLING COMPONENT A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2265221A
Cited
CH200391A
Cited
US2217189A
Cited
US2353205A
Cited
US2334495A
Cited
US2354552A
Cited
US2455170A
Cited
US2459226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |