Patent US2822378A successfully refreshed from Google Patents.
US2822378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing esters
Assignee: PPG Industries Inc
•
Filing: 1953-04-23
•
Granted: 1958-02-04
•
Expires: 1973-04-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred R Bader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:33
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
THE METHOD OF PREPARING ESTERS OF A PHENOL AND A CARBOXYLIC ACID WHICH COMPRISES MIXING THE PHENOL AND THE CARBOXYLIC ACID WITH ABOUT 10 TO 100 PERCENT, BASED UPON THE ESTERIFIABLE MIXTURE, OF FREE LIQUID POLYPHOSPHORIC ACID AND HEATING THE MIXTURE TO ESTERIFICATION TEMPERATURE WHEREBY TO OBTAIN SAID ESTER.
Claim 2
Independent Claim
49 words
THE METHOD OF PREPARING ESTERS OF A PHENOL AND A CARBOXYLIC ACID WHICH COMPRISES MIXING THE PHENOL AND THE CARBOXYLIC ACID WITH ABOUT 10 TO 100 PERCENT, BASED UPON THE ESTERIFIABLE MIXTURE, OF FREE LIQUID POLYPHOSPHORIC ACID AND HEATING THE MIXTURE TO ESTERIFICATION TEMPERATURE WHEREBY TO OBTAIN SAID ESTER.
References Cited (Backward Citations)
US948084A
Cited
US2422016A
Cited
US2496791A
Cited
US2477327A
Cited
US2586852A
Cited
US2575457A
Cited
US2647921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |