US2522034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-hydroxy-8-acylamino anthraquinone dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1947-07-29
•
Granted: 1950-09-12
•
Expires: 1967-07-29
Abstract
No abstract record available.
Inventors
- 👤 Grossmann Paul
- 👤 Kern Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:22
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/516; C09B1/5165; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921; Y10S8/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A DYESTUFF OF THE GENERAL FORMULA
Claim 2
Dependent Claim
6 words
A DYESTUFF OF THE GENERAL FORMULA
References Cited (Backward Citations)
DE148875C
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DE290983C
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DE211958C
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DE213960C
Cited
US1871821A
Cited
US2137295A
Cited
US2381971A
Cited
US2294968A
Cited
US2383236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |