US2661291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antidiffusion diazotypes having tetrazo diphenyls as the light sensitive agent
Assignee: GAF Chemicals Corp
•
Filing: 1949-01-19
•
Granted: 1953-12-01
•
Expires: 1969-01-19
Abstract
No abstract record available.
Inventors
- 👤 Slifkin Sam Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:39
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS OF PRODUCING PHOTOPRINTS CONTAINING AZO DYESTUFF IMAGES WHICH COMPRISES EXPOSING UNDER A PATTERN TO RAYS OF ULTRAVIOLET LIGHT A LIGHT-SENSITIVE MATERIAL COMPRISING A BASE HAVING THEREON A LIGHT-SENSITIVE LAYER CONTAINING A LIGHT SENSITIVE TETRAZO DERIVATIVE OF AN AROMATIC DIAMINE HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
45 words
A PROCESS OF PRODUCING PHOTOPRINTS CONTAINING AZO DYESTUFF IMAGES WHICH COMPRISES EXPOSING UNDER A PATTERN TO RAYS OF ULTRAVIOLET LIGHT A LIGHT-SENSITIVE MATERIAL COMPRISING A BASE HAVING THEREON A LIGHT-SENSITIVE LAYER CONTAINING A LIGHT SENSITIVE TETRAZO DERIVATIVE OF AN AROMATIC DIAMINE HAVING THE 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) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |