Patent US2537919A successfully refreshed from Google Patents.
US2537919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazotype layer containing three coupling components for neutral black shades
Assignee: GAF Chemicals Corp
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Filing: 1948-05-05
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Granted: 1951-01-09
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Expires: 1968-05-05
Abstract
No abstract record available.
Inventors
- 👤 Slifkin Sam Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:15
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
LIGHT SENSITIVE DIAZOTYPE LAYERS CAPABLE OF PRODUCING UNIFORM NEUTRAL BLACK IMAGES IN ALL DENSITY AREAS COMPRISING IN COMBINATION A LIGHT SENSITIVE DIAZO COMPOUND DERIVED FROM A P-DIAMINE OF THE BENZENE SERIES TWO COUPLING COMPONENTS OF VARYING COUPLING POTENTIAL ONE OF WHICH IS A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
47 words
LIGHT SENSITIVE DIAZOTYPE LAYERS CAPABLE OF PRODUCING UNIFORM NEUTRAL BLACK IMAGES IN ALL DENSITY AREAS COMPRISING IN COMBINATION A LIGHT SENSITIVE DIAZO COMPOUND DERIVED FROM A P-DIAMINE OF THE BENZENE SERIES TWO COUPLING COMPONENTS OF VARYING COUPLING POTENTIAL ONE OF WHICH IS A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
FR660087A
Cited
US1807761A
Cited
GB331459A
Cited
US1822065A
Cited
US1816989A
Cited
US1989065A
Cited
US2037542A
Cited
US2181944A
Cited
US2196950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |