US3770837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenolysis of beta hydroxy carboxylic acid lactones
Assignee: Celanese Corp
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Filing: 1971-01-05
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Granted: 1973-11-06
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Expires: 1991-01-05
Abstract
Abstract A BETA-HYDROXY CARBOXYLIC ACID LACTONE, SUCH AS BETAHYDROXY PROPIONIC ACID LACTONE, IS HYDROGENOLYZED TO THE CORRESPONDING 1,3-PROPANEDIOL IN THE PRESENCE OF A RHENIUM CATALYST AT ELEVATED TEMPERATURESAND PRESSURES.
Inventors
- 👤 N Favstritsky
- 👤 A Stautzenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:46
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/132; C07C29/136; C07C29/147; C07C29/149
Claims Analysis
Total Claims: 0
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |