Patent US3740416A successfully refreshed from Google Patents.
US3740416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
(+)-cis - 1,3-dibenzyl-hexahydro-1h-thieno-(3,4-d)imidazoles - 2,4-dione, and process for tis preparation
Assignee: F Hoffmann La Roche AG
•
Filing: 1970-11-17
•
Granted: 1973-06-19
•
Expires: 1990-11-17
Abstract
Abstract RACEMIC AND (+)-CIS - 1,3 - DIBENZYL-HEXAHYDRO-1H THEINO (3,4-D: IMIDAZOLE - 2,4-DIONE AND VARIOUS INTERMEDIATES, PREPARED FROM THE CORRESPONDING CIS-1,3-DIBENZYL-HEXAHYDRO-1H-FURO(3,4-D)IMIDAZOLE,2,4-DIOME, ARE DESCRIBED. THE END PRODUCTS ARE VALUABLE INTERMEDIATES IN THE SYNTHESIS OF (+)-BIOTIN, AS WELL AS DERIVATIVES AND RELATED PRODUCTS THEREOF. PROCESSES FOR THE SYNTHESIS OF (+)-BIOTIN ARE ALSO DESCRIBED.
Inventors
- 👤 M Gerecke
- 👤 J Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:12
CPC Classifications
C; C07; C07D; C07D495/00; C07D495/02; C07D495/04; C07D495/12; C07D495/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |