Patent US2551570A successfully refreshed from Google Patents.
US2551570A
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Azo dye components of the amino naphthol series for diazotypes
Assignee: GAF Chemicals Corp
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Filing: 1946-10-24
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Granted: 1951-05-01
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Expires: 1966-10-24
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
2026-10-30 23:13
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
DIAZOTYPE MATERIALS COMPRISING A LIGHTSENSITIVE DIAZO COMPOUND SUITABLE FOR TWO-COMPONENT DIAZOTYPE COMPOSITIONS AND AN AMINO NAPHTHOL SELECTED FROM THE CLASS CONSISTING OF THOSE REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
27 words
DIAZOTYPE MATERIALS COMPRISING A LIGHTSENSITIVE DIAZO COMPOUND SUITABLE FOR TWO-COMPONENT DIAZOTYPE COMPOSITIONS AND AN AMINO NAPHTHOL SELECTED FROM THE CLASS CONSISTING OF THOSE REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
US1936957A
Cited
US1870930A
Cited
US2150565A
Cited
US2196950A
Cited
US2233038A
Cited
US2298444A
Cited
US2375366A
Cited
US2369929A
Cited
US2448158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |