US3225066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of tetrahydrofuran-cis, 2,5-dicarboxylic acid and salts thereof
Assignee: Zeneca Inc
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Filing: 1963-04-18
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Granted: 1965-12-21
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Expires: 1983-04-18
Abstract
No abstract record available.
Inventors
- 👤 Baak W Lew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:58
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/18; C07D307/24; C08; C08G; C08G63/00; C08G63/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A PROCESS OF PREPARING TETRAHYDROFURAN-CIS 2,5-DICARBOXYLIC ACID AND SALTS THEREOF WHICH COMPRISES THE STEPS OF REACTING A STARTING MATERIAL HAVING THE GENERAL FORMULA OF
Claim 2
Dependent Claim
24 words
A PROCESS OF PREPARING TETRAHYDROFURAN-CIS 2,5-DICARBOXYLIC ACID AND SALTS THEREOF WHICH COMPRISES THE STEPS OF REACTING A STARTING MATERIAL HAVING THE GENERAL FORMULA OF
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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |