US2552354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazotype layers containing diazos of n-(2-hydroxypropyl)-phenylenediamines
Assignee: GAF Chemicals Corp
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Filing: 1947-04-16
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Granted: 1951-05-08
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Expires: 1967-04-16
Abstract
No abstract record available.
Inventors
- 👤 Glahn William H Von
- 👤 Lester N Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:59
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
AN ALKALINE DEVELOPABLE DIAZOTYPE PHOTOGRAPHIC MATERIAL COMPRISING A LIGHT SENSITIVE DIAZONIUM COMPOUND OF A P-PHENYLENDIAMINE HAVING THE FORMULA
Claim 2
Dependent Claim
18 words
AN ALKALINE DEVELOPABLE DIAZOTYPE PHOTOGRAPHIC MATERIAL COMPRISING A LIGHT SENSITIVE DIAZONIUM COMPOUND OF A P-PHENYLENDIAMINE HAVING THE FORMULA
References Cited (Backward Citations)
US2217189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |