US3928391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certain cyclopentafuran diols substituted by certain-3-hydroxyalkyl (or alkenyl) groups useful in the preparation of prostaglandin analogs
Assignee: Pfizer Inc
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Filing: 1974-08-27
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Granted: 1975-12-23
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Expires: 1994-08-27
Abstract
Abstract The 2-descarboxy-2-(tetrazol-5-yl)- omega pentanorprostaglandins and various intermediates employed in their preparation. The novel prostaglandins of this invention have been found to have activity profiles comparable to the parent prostaglandins, but exhibit a longer duration of action than the parent prostaglandins.
Inventors
- 👤 Hans-Jurgen E Hess
- 👤 Leonard J Czuba
- 👤 Thomas K Schaaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:10
CPC Classifications
C; C07; C07D; C07D257/00; C07D257/02; C07D257/04; C07C; C07C405/00; C07D307/00; C07D307/77; C07D307/93; C07D307/935; C07D309/00; C07D309/02; C07D309/08; C07D309/10; C07D309/12; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5407; C07F9/547; C07F9/6524; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
2 words
A COMPOUND
Claim 2
Dependent Claim
2 words
A COMPOUND
References Cited (Backward Citations)
US3711515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |