US2837523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone vat dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1952-12-19
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Granted: 1958-06-03
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Expires: 1972-12-19
Abstract
No abstract record available.
Inventors
- 👤 Grelat Maurice
- 👤 Koch Jacob
- 👤 Sutter Paul
- 👤 Kern Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:09
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/24; C09B5/26; C09B5/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
AN ANTHRAQUINONE DYESTUFF OF THE FORMULA
Claim 2
Dependent Claim
6 words
AN ANTHRAQUINONE 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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |