Patent US3836665A successfully refreshed from Google Patents.
US3836665A
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Dermatological compositions containing certain higher alkyl esters of 5-pyrrolidone-(2)-carboxylic acid
Assignee: C.H. Boehringer Sohn AG and Co KG
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Filing: 1972-01-12
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Granted: 1974-09-17
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Expires: 1992-01-12
Abstract
Abstract TOPICAL DERMATOLOGICAL COMPOSITIONS CONTAINING FROM 0.1 TO 10% BY WEIGHT OF A HIGHER ALKYL ESTER OF 5-PYRROLIDONE-(2)-CARBOXYLIC ACID OF THE FORMULA 2-(RO-CO-)-5-PYRROLIDONE ((NC-),R1-PHENYL)-O-CH2-CH(-OH)-CH2-NH-C(-CH3)<(-(CH2)N-) WHEREIN R IS STRAIGHT OR BRANCHED ALKYL OF 8-30 CARBON ATOMS.
Inventors
- 👤 H Eberhardt
- 👤 H Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:02
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/273; C07D207/277; C07D207/28; A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/49; A61K8/4906; A61K8/4913; A61Q; A61Q19/00; A61Q5/00; A61Q5/006; A61Q5/02
Claims Analysis
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |