US2853492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of anthraquinone vat dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1957-05-13
•
Granted: 1958-09-23
•
Expires: 1977-05-13
Abstract
No abstract record available.
Inventors
- 👤 Grelat Maurice
- 👤 Fioroni Walter
- 👤 Kern Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:15
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/24; C09B5/26; C09B5/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A PROCESS FOR THE MANUFACTURE OF ANTHRAQUINONE VAT DYESTUFFS WHICH COMPRISES CONDENSING ONE MOL OF A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
20 words
A PROCESS FOR THE MANUFACTURE OF ANTHRAQUINONE VAT DYESTUFFS WHICH COMPRISES CONDENSING ONE MOL OF A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
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US2385113A
Cited
US2539193A
Cited
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Cited
US2672462A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |