Patent US2578178A successfully refreshed from Google Patents.
US2578178A
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Azathiazolone cyanine dyes and their preparation
Assignee: GAF Chemicals Corp
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Filing: 1949-12-16
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Granted: 1951-12-11
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Expires: 1969-12-16
Abstract
No abstract record available.
Inventors
- 👤 Henry G Derbyshire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:50
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/16; C09B23/162; C09B23/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
AZATHIAZOLONE CYANINE DYES CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
9 words
AZATHIAZOLONE CYANINE DYES CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2394067A
Cited
US2464785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |