US2570052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monoazo dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1947-02-18
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Granted: 1951-10-02
•
Expires: 1967-02-18
Abstract
No abstract record available.
Inventors
- 👤 Felix Friedrich
- 👤 Heckendorn Alphonse
- 👤 Widmer Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/02; D06P1/10; C; C09; C09B; C09B43/00; C09B43/18; C09B45/00; C09B45/02; C09B45/14; C09B45/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
8 words
A MONOAZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
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US1824914A
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US2276187A
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GB510091A
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US2237483A
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US2249956A
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US2274544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |