US2904567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telomer acid process
Assignee: 3M Co
•
Filing: 1956-08-28
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Granted: 1959-09-15
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Expires: 1976-08-28
Abstract
No abstract record available.
Inventors
- 👤 William S Barnhart
- 👤 Robert H Wade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:15
CPC Classifications
C; C07; C07C; C07C55/00; C07C55/32; C07C51/00; C07C51/093; C07C53/00; C07C53/15; C07C53/19; C07C53/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
AN IMPROVED PROCESS FOR THE PREPARATION OF A PERHALOGENATED CARBOXYLIC ACID WHICH COMPRISES TREATING WITH FUMING SULFURIC ACID AT A TEMPERATURE BETWEEN ABOUT 175* C. AND ABOUT 250* C. A FLUORINE CONTAINING TELOMER OF THE FROMULA C1(CF2CFC1)NC1 WHERE N IS AN INTEGER FROM 2 TO 16 IN THE PRESENCE OF AN ADDED AMOUNT OF SAID PERHALOGENATED CARBOXYLIC ACID, COOLING THE REACTION MIXTURE AND SUBSEQUENTLY TREATING THE REACTION PRODUCT WITH WATER AND RECOVERING THE ACID PRODUCED.
Claim 2
Dependent Claim
75 words
AN IMPROVED PROCESS FOR THE PREPARATION OF A PERHALOGENATED CARBOXYLIC ACID WHICH COMPRISES TREATING WITH FUMING SULFURIC ACID AT A TEMPERATURE BETWEEN ABOUT 175* C. AND ABOUT 250* C. A FLUORINE CONTAINING TELOMER OF THE FROMULA C1(CF2CFC1)NC1 WHERE N IS AN INTEGER FROM 2 TO 16 IN THE PRESENCE OF AN ADDED AMOUNT OF SAID PERHALOGENATED CARBOXYLIC ACID, COOLING THE REACTION MIXTURE AND SUBSEQUENTLY TREATING THE REACTION PRODUCT WITH WATER AND RECOVERING THE ACID PRODUCED.
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |