US2575896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diesters of unsaturated dihydric alcohols and preparation of the same
Assignee: Shell Development Co
•
Filing: 1949-04-14
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Granted: 1951-11-20
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Expires: 1969-04-14
Abstract
No abstract record available.
Inventors
- 👤 Curtis W Smith
- 👤 Douglas G Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:44
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/28; C07C67/293; C07C67/08; C07C69/00; C07C69/007; C07C69/02; C07C69/12; C07C69/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS OF PREPARING 1,3-DIACETOXYPROPENE WHICH COMPRISES HEATING 1,1-DIACETOXY-2-PROPENE AT A TEMPERATURE FROM ABOUT 90* C. TO ABOUT 125* C. IN THE PRESENCE OF FROM ABOUT 0.1 PER CENT TO ABOUT 2 PER CENT BY WEIGHT OF A STRONG MINERAL ACID.
Claim 2
Dependent Claim
41 words
A PROCESS OF PREPARING 1,3-DIACETOXYPROPENE WHICH COMPRISES HEATING 1,1-DIACETOXY-2-PROPENE AT A TEMPERATURE FROM ABOUT 90* C. TO ABOUT 125* C. IN THE PRESENCE OF FROM ABOUT 0.1 PER CENT TO ABOUT 2 PER CENT BY WEIGHT OF A STRONG MINERAL ACID.
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) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |