Patent US2671775A successfully refreshed from Google Patents.
US2671775A
Expired / Lapsed
US
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Trisazo dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1951-06-11
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Granted: 1954-03-09
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Expires: 1971-06-11
Abstract
No abstract record available.
Inventors
- 👤 Hanhart Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:56
CPC Classifications
C; C09; C09B; C09B31/00; C09B31/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A TRISAZO DYESTUFF CORRESPONSING TO THE FORMULA
Claim 2
Dependent Claim
7 words
A TRISAZO DYESTUFF CORRESPONSING TO THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |