Patent US3738678A successfully refreshed from Google Patents.
Patent US2824122A successfully refreshed from Google Patents.
US2824122A
Expired / Lapsed
US
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Purification of alpha, omega alkanedioic acids by partial esterification
Assignee: CP Hall Co
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Filing: 1955-05-24
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Granted: 1958-02-18
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Expires: 1975-05-24
Abstract
No abstract record available.
Inventors
- 👤 Vincent P Kuceski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:02
CPC Classifications
C; C07; C07C; C07C55/00; C07C55/02; C07C67/00; C07C67/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE PROCESS OF ESTERIFYING A LESS POLAR ALPHA, OMEGAALKANEDIOIC ACID IN THE PRESENCE OF A MORE POLAR ALPHA, OMEGA-ALKANEDIOIC ACID IN AN AQUEOUS SOLUTION, WITH AN ALCOHOL IN AN IMMISCIBLE LAYER IN CONTACT WITH THE AQUEOUS LAYER, WHICH COMPRISES EFFECTING PARTIAL ESTERIFICATION WITH LOSS OF WATER, THE LESS POLAR ACID THEREBY ESTERIFYING IN PREFERENCE TO THE MORE POLAR ACID AND THE PARTIAL ESTER OF SAID LESS POLAR ACID AS FORMED DISSOLVING INTO THE ALCOHOL LAYER, SEPARATING THE LAYERS, AND THEREAFTER EFFECTING MORE COMPLETE ESTERIFICATION OF THE LESS POLAR ACID.
Claim 2
Dependent Claim
89 words
THE PROCESS OF ESTERIFYING A LESS POLAR ALPHA, OMEGAALKANEDIOIC ACID IN THE PRESENCE OF A MORE POLAR ALPHA, OMEGA-ALKANEDIOIC ACID IN AN AQUEOUS SOLUTION, WITH AN ALCOHOL IN AN IMMISCIBLE LAYER IN CONTACT WITH THE AQUEOUS LAYER, WHICH COMPRISES EFFECTING PARTIAL ESTERIFICATION WITH LOSS OF WATER, THE LESS POLAR ACID THEREBY ESTERIFYING IN PREFERENCE TO THE MORE POLAR ACID AND THE PARTIAL ESTER OF SAID LESS POLAR ACID AS FORMED DISSOLVING INTO THE ALCOHOL LAYER, SEPARATING THE LAYERS, AND THEREAFTER EFFECTING MORE COMPLETE ESTERIFICATION OF THE LESS POLAR ACID.
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) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |