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Patent US3816463A successfully refreshed from Google Patents.
US3816463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tricyclic glycol
Assignee: Pharmacia and Upjohn Co
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Filing: 1972-12-15
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Granted: 1974-06-11
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Expires: 1992-12-15
Abstract
Abstract 4-(M-O-CH(-W)-CH(-O-E)-)PERHYDROCYCLOPROPA(3,4)- CYCLOPENTA(1,2-B)FURAN-2-ONE PROCESS FOR PREPARING OPTICALLY ACTIVE TRICYCLIC GLYCOLS OF THE FORMULA OR THE MIRROR IMAGE THEREOF, OR A RACEMIC COMPOUND OF THAT FORMULA AND THE MIRROR IMAGE THEREOF, WHEREIN E AND M ARE BOTH HYDRGEN OR WHEREIN ONE OF E AND M IS HYDROGEN AND THE OTHER IS FORMYL, WHEREIN W IS 1-PHENYL CIS-1-PENT-ENYL OR 1-PENT-2-YNYL. THE TRICYCLIC GLYCOLS ARE USEFUL INTERMEDIATES IN PREPARING PROSTAGLAMDINS HAING PHARMACOLOGICAL UTILITY.
Inventors
- 👤 R Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:32
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/04; C07C; C07C405/00; C07D307/00; C07D307/77; C07D307/93; C07D307/935; C07D317/00; C07D317/08; C07D317/10; C07D317/12; C07D317/14; C07D317/26; C07D319/00; C07D319/04; C07D319/06; C07D319/10; C07D319/14; C07D319/16
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |