Patent US3790558A successfully refreshed from Google Patents.
US3790558A
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Pyrazolidone derivatives substituted on the 4 position with pectin or algin
Assignee: Purdue Frederick Co
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Filing: 1971-11-18
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Granted: 1974-02-05
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Expires: 1991-11-18
Abstract
Abstract HYDROGEN BONDED COMPOUNDS OF THE STRUCTURE: 1,2-DIPHENYL,3,4-(-O-Z-),4-(CH3-CH2-CH2-CH2-),5-(O=) PYRAZOLIDINE WHEREIN Z IS A COMPOUND OF THE GROUP SELECTED FROM ALGIN AND PECTIN AND THE METHODS FOR THE PREPARATION OF THE AFORESAID COMPOUNDS. THE COMPOUNDS ARE USEFUL IN ACHIEVING AN ANTI-INFLAMMATORY EFFECT.
Inventors
- 👤 G Negrevergne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:26
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/14; A61K47/00; A61K47/50; A61K47/51; A61K47/56; A61K47/58; A61K47/59; A61K47/60; A61K47/61; C; C07; C07H; C07H17/00; C07H17/02; C08; C08B; C08B37/00; C08F; C08F8/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |