Patent US2618652A successfully refreshed from Google Patents.
US2618652A
Expired / Lapsed
US
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Process for the purification of acrylate and methacrylate esters
Assignee: Standard Oil Development Co
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Filing: 1950-04-21
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Granted: 1952-11-18
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Expires: 1970-04-21
Abstract
No abstract record available.
Inventors
- 👤 Jr William C Hollyday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:27
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/60; C07C67/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS FOR THE PURIFICATION OF AN UNSATURATED ESTER MONOMER SELECTED FROM THE CLASS CONSISTING OF ACRYLATE AND METHACRYLATE ESTERS OF SATURATED ALIPHATIC ALCOHOLS PREPARED BY AN ESTER INTERCHANGE REACTION UTILIZING P-TOLUENE SULFONIC ACID AS A CATALYST WHICH COMPRISES PASSING A STREAM OF ANHYDROUS AMMONIA THROUGH THE CRUDE ESTER INTERCHANGE PRODUCT, FILTERING OFF THE RESULTING PRECIPIATE, WASHING THE FILTRATE SUCCESSIVELY WITH WATER AND AN ALKALINE SOLUTION, AND RECOVERING A SUBSTANTIALLY PURE UNSATURATED ESTER MONOMER.
Claim 2
Dependent Claim
74 words
A PROCESS FOR THE PURIFICATION OF AN UNSATURATED ESTER MONOMER SELECTED FROM THE CLASS CONSISTING OF ACRYLATE AND METHACRYLATE ESTERS OF SATURATED ALIPHATIC ALCOHOLS PREPARED BY AN ESTER INTERCHANGE REACTION UTILIZING P-TOLUENE SULFONIC ACID AS A CATALYST WHICH COMPRISES PASSING A STREAM OF ANHYDROUS AMMONIA THROUGH THE CRUDE ESTER INTERCHANGE PRODUCT, FILTERING OFF THE RESULTING PRECIPIATE, WASHING THE FILTRATE SUCCESSIVELY WITH WATER AND AN ALKALINE SOLUTION, AND RECOVERING A SUBSTANTIALLY PURE UNSATURATED ESTER MONOMER.
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) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |