Patent US2476259A successfully refreshed from Google Patents.
US2476259A
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US
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Disazo dye from dihydroxy benzidine and process therefor
Assignee: BASF Schweiz AG
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Filing: 1947-02-28
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Granted: 1949-07-12
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Expires: 1967-02-28
Abstract
No abstract record available.
Inventors
- 👤 Mayer Hans
- 👤 Widmer Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:31
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/08; C07; C07H; C07H1/00; C07H1/02
Claims Analysis
Total Claims: 0
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US2426977A
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US2427537A
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US2424006A
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US2404198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-11 | 1953-01-10 | 1953-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-11 | 1957-01-10 | 1957-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-11 | 1961-01-10 | 1961-07-12 | $7700.00 | Window Closed / Lapsed |