Patent US2593428A successfully refreshed from Google Patents.
US2593428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of diphenylol propane in esterification and ester products
Assignee: Standard Oil Development Co
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Filing: 1950-06-21
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Granted: 1952-04-22
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Expires: 1970-06-21
Abstract
No abstract record available.
Inventors
- 👤 Wilbur F Fischer
- 👤 Jr Frederick Knoth
- 👤 Raymond G Newberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:40
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
IN A PROCESS FOR THE PREPARATION OF AN ORGANIC ESTER FROM AN ORGANIC CARBOXYLIC ACID AND A BRANCHED SATURATED ALIPHATIC MONOHYDRIC UNSUBSTITUTED ALCOHOL THE IMPROVEMENT WHICH COMPRISES ADDING TO THE ESTERIFICATION MIXTURE A MINOR PROPORTION OF A BISPOHENOL COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
42 words
IN A PROCESS FOR THE PREPARATION OF AN ORGANIC ESTER FROM AN ORGANIC CARBOXYLIC ACID AND A BRANCHED SATURATED ALIPHATIC MONOHYDRIC UNSUBSTITUTED ALCOHOL THE IMPROVEMENT WHICH COMPRISES ADDING TO THE ESTERIFICATION MIXTURE A MINOR PROPORTION OF A BISPOHENOL COMPOUND HAVING THE FORMULA
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) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |