Patent US2763640A successfully refreshed from Google Patents.
US2763640A
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US
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Cupriferous azo-dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1953-12-21
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Granted: 1956-09-18
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Expires: 1973-12-21
Abstract
No abstract record available.
Inventors
- 👤 Riat Henri
- 👤 Dreyfuss Paul
- 👤 Oesterlein Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:31
CPC Classifications
C; C09; C09B; C09B56/00; C09B56/04; C09B43/00; C09B43/12; C09B45/00; C09B45/02; C09B45/24; C09B45/28; C09B45/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
AN AZO-DYESTUFF OF THE FORMULA
Claim 2
Dependent Claim
5 words
AN AZO-DYESTUFF OF THE 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) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |