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US2533178A
Expired / Lapsed
US
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alpha-(phthalimidomethyl-anilino)-anthraquinones and process of preparing the same
Assignee: GAF Chemicals Corp
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Filing: 1948-05-01
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Granted: 1950-12-05
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Expires: 1968-05-01
Abstract
No abstract record available.
Inventors
- 👤 David I Randall
- 👤 Jr Edgar E Renfrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:03
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
8 words
AN ANTHRAQUINONE DYESTUFF CHARACTERIZED BY THE FOLLOWING FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |