US2653149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cupriferous disazo-dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1951-06-22
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Granted: 1953-09-22
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Expires: 1971-06-22
Abstract
No abstract record available.
Inventors
- 👤 Riat Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:12
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/136; C09B43/16; C09B45/00; C09B45/02; C09B45/24; C09B45/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
7 words
THE CUPRIFEROUS DISAZO DYESTUFF OF THE FORMULA:
References Cited (Backward Citations)
US1667312A
Cited
US1779298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |