Patent US3086831A successfully refreshed from Google Patents.
US3086831A
Expired / Lapsed
US
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Compositions of a pyrazolone azo dye with polyvinylpyrrolidone
Assignee: Wyeth Holdings LLC
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Filing: 1959-07-01
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Granted: 1963-04-23
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Expires: 1979-07-01
Abstract
No abstract record available.
Inventors
- 👤 Woodrow W Robbins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:10
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/642; D06P1/649; D06P1/6495; C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A DYE COMPOSITION COMPRISING A HEAVY METAL DYE COMPLEX HAVING ONE ATOM OF CHROMIUM CHELATED WITH TWO MOLECULES OF THE DYESTUFF OF THE FORMULA
Claim 2
Dependent Claim
24 words
A DYE COMPOSITION COMPRISING A HEAVY METAL DYE COMPLEX HAVING ONE ATOM OF CHROMIUM CHELATED WITH TWO MOLECULES OF THE DYESTUFF OF THE FORMULA
References Cited (Backward Citations)
US1239526A
Cited
US1711009A
Cited
US2784179A
Cited
US2784178A
Cited
US2806760A
Cited
US2903325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-22 | 1966-10-22 | 1967-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-22 | 1970-10-22 | 1971-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-22 | 1974-10-22 | 1975-04-23 | $7700.00 | Window Closed / Lapsed |