US2562849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of esters of alpha, betaolefinic carboxylic acids
Assignee: Shell Development Co
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Filing: 1949-07-01
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Granted: 1951-07-31
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Expires: 1969-07-01
Abstract
No abstract record available.
Inventors
- 👤 Richard R Whetstone
- 👤 William J Raab
- 👤 Seaver A Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:21
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/30; C07C67/333
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
A PROCESS FOR THE CONTROLLED PYROLYSIS OF AN ESTER OF A *5-DIHYDROPYRAN-2-CARBOXYLIC ACID WITH A -5-DIHYDROPYRAN-2-METHANOL TO SELECTIVELY PRODUCE A VALUABLE POLYMERIZABLE ESTER OF AN OPEN-CHAIN ALPHA,BETA-OLEFINIC CARBOXYLIC ACID WITH AN OPEN-CHAIN BETA,GAMMA-OLEFINIC ALCOHOL, WHICH COMPRISES RAPIDLY HEATING SAID HETEROCYCLIC ESTER WHILE IN LIQUID STATE TOWARD A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 350* C. TO ABOUT 750* C., SIMULTANEOUSLY WITH SAID HEATING FLASHING THE ESTER FROM LIQUID PHASE TO GASEOUS PHAE, SUBJECTING SAID FROM LIQUID PHASE TO GCONTROLLED PYROLYSIS WITHIN THE RANGE OF FROM ABOUT 350* C. TO ABOUT 750* C. AND RECOVERING A POLYMERIZABLE ESTER OF AN OPEN-CHAIN ALPHA,BETAOLEFINIC CARBOXYLIC ACID WITH AN OPEN-CHAIN BETA,GAMMA-OLEFINIC ALCOHOL FROM THE PRODUCTS OF THE PYROLYSIS.
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) | 1954-07-30 | 1955-01-29 | 1955-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-30 | 1959-01-29 | 1959-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-30 | 1963-01-29 | 1963-07-31 | $7700.00 | Window Closed / Lapsed |