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Patent US2489235A successfully refreshed from Google Patents.
US2489235A
Expired / Lapsed
US
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Synthesis of biotin
Assignee: F Hoffmann La Roche AG
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Filing: 1947-07-24
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Granted: 1949-11-22
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Expires: 1967-07-24
Abstract
No abstract record available.
Inventors
- 👤 Goldberg Moses Wolf
- 👤 Leo H Sternbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:26
CPC Classifications
C; C07; C07D; C07D495/00; C07D495/02; C07D495/04; C07D495/12; C07D495/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |