Patent US2655448A successfully refreshed from Google Patents.
US2655448A
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Diazotype photoprinting process
Assignee: GAF Chemicals Corp
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Filing: 1949-03-08
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Granted: 1953-10-13
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Expires: 1969-03-08
Abstract
No abstract record available.
Inventors
- 👤 Sam C Slifkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:41
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A PROCESS OF PRODUCING PHOTOPRINTS CONTAINING AZO DYESTUFF IMAGES WHICH COMPRISES EXPOSING UNDER A PATTERN TO RAYS OF ULTRAVIOLET LIGHT-SENSITIVE MATERIAL COMPRISING A BASE HAVING THEREON A LIGHT-SENSITIVE LAYER CONTAINING A LIGHT-SENSITIVE MONODAIZO DERIVATIVE OF AN AROMATIC DIAMINE HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
42 words
A PROCESS OF PRODUCING PHOTOPRINTS CONTAINING AZO DYESTUFF IMAGES WHICH COMPRISES EXPOSING UNDER A PATTERN TO RAYS OF ULTRAVIOLET LIGHT-SENSITIVE MATERIAL COMPRISING A BASE HAVING THEREON A LIGHT-SENSITIVE LAYER CONTAINING A LIGHT-SENSITIVE MONODAIZO DERIVATIVE OF AN AROMATIC DIAMINE HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US2045324A
Cited
US2336309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |