Patent US2920081A successfully refreshed from Google Patents.
US2920081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 2, 5-dialkoxy-tetrahydrofuran
Assignee: Union Carbide Corp
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Filing: 1957-05-08
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Granted: 1960-01-05
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Expires: 1977-05-08
Abstract
No abstract record available.
Inventors
- 👤 Walter R Privette
- 👤 Helmut W Schulz
- 👤 Donald M Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:48
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/18; C07D307/20; C07C; C07C45/00; C07C45/56; C07C45/57; C07C45/59
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR THE PREPARATION OF A SUBSTITUTED TETRAHYDROFURAN WHICH COMPRISES REACTING 4,4-DIACYLOXYBUTYRALDEHYDE OF THE FORMULA (RCOO)2CHCH2CH2CHO WHEREIN R IS AN ALKYL GROUP CONTAINING 1 TO 8 CARBON ATOMS AND A LOWER ALKYL ALCOHOL IN THE PRESENCE OF A STRONG ACID CATALYST AND THEREAFTER RECOVERING 2,5-DIALKOXYTETRAHYDROFURAN.
Claim 2
Dependent Claim
46 words
A PROCESS FOR THE PREPARATION OF A SUBSTITUTED TETRAHYDROFURAN WHICH COMPRISES REACTING 4,4-DIACYLOXYBUTYRALDEHYDE OF THE FORMULA (RCOO)2CHCH2CH2CHO WHEREIN R IS AN ALKYL GROUP CONTAINING 1 TO 8 CARBON ATOMS AND A LOWER ALKYL ALCOHOL IN THE PRESENCE OF A STRONG ACID CATALYST AND THEREAFTER RECOVERING 2,5-DIALKOXYTETRAHYDROFURAN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |