US3818048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dihydrofuran derivatives
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1972-03-20
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Granted: 1974-06-18
•
Expires: 1992-03-20
Abstract
Abstract 2-( Alpha -Alkoxycarbonylbenzylidene)-4-phenyl-3-hydroxy-5-oxo2,5-dihydrofuran derivatives, process for their preparation, and pharmaceutical compositions comprising said dihydrofuran derivatives. Compounds have anti-inflammatory activity.
Inventors
- 👤 F Foden
- 👤 Mant D O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:12
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D493/00; C07D493/02; C07D493/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
Compound of the formula Ia as claimed in claim 1 wherein A and B stand for a chlorine atom.
Claim 2
Dependent Claim
19 words
Compound of the formula Ib as claimed in claim 1 wherein D and E stand for a chlorine atom.
Claim 3
Dependent Claim
13 words
A compound as claimed in claim 1 which is 2-( Alpha -methoxycarbonylbenzylidene)-4-(3,5-dichlorphenyl)-3-hydroxy-5-oxo-2,5 -dihydrofuran.
Claim 4
Dependent Claim
11 words
A compound as claimed in claim 1 which is 2-(3,5-dichloro-Alpha -methoxycarbonylbenzylidene)-4-phenyl-3-hydroxy-5-oxo-2,5-dihydrofuran.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |