US3351644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of telomeric acid fluorides
Assignee: Pennwalt Corp
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Filing: 1963-10-15
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Granted: 1967-11-07
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Expires: 1983-10-15
Abstract
No abstract record available.
Inventors
- 👤 Hauptschein Murray
- 👤 Chester L Parris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:16
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/093; C07C51/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A METHOD FOR THE PRODUCTION OF TETRFLUOROETHYLENE TELOMER ACID FLUORIDES WHICH COMPRISES THE STEPS OF REACTING A TETRAFLUOROETHYLENE TELOMER IODIDE OF THE FORMULA R1(CF2CF2)NI WHERE N IS A SMALL INTEGER FROM 1 TO ABOUT 8 AND WHERE RF IS SELECTED FROM THE CLASS CONSISTING OF PERFLUOROALKYL AND W-MONOCHLOROPERFLUOROALKYL RADICALS WITH FUMING SULFURIC ACID CONTAINING FROM ABOUT 20% TO 65% BY WEIGHT OF SO3 AT A TEMPERATURE OF FROM 130 TO 200*C. AND FOR A REACTION TIME OF FROM 1 TO 20 HOURS, THE SHORTER OF SAID REACTION TIMES BEING EMPLOYED AT THE HIGHER TEMPERATURES IN SAID RANGE, THEREBY PRODUCING A TELOMER ACID FLUORIDE OF THE FORMULA
Claim 2
Independent Claim
106 words
A METHOD FOR THE PRODUCTION OF TETRFLUOROETHYLENE TELOMER ACID FLUORIDES WHICH COMPRISES THE STEPS OF REACTING A TETRAFLUOROETHYLENE TELOMER IODIDE OF THE FORMULA R1(CF2CF2)NI WHERE N IS A SMALL INTEGER FROM 1 TO ABOUT 8 AND WHERE RF IS SELECTED FROM THE CLASS CONSISTING OF PERFLUOROALKYL AND W-MONOCHLOROPERFLUOROALKYL RADICALS WITH FUMING SULFURIC ACID CONTAINING FROM ABOUT 20% TO 65% BY WEIGHT OF SO3 AT A TEMPERATURE OF FROM 130 TO 200*C. AND FOR A REACTION TIME OF FROM 1 TO 20 HOURS, THE SHORTER OF SAID REACTION TIMES BEING EMPLOYED AT THE HIGHER TEMPERATURES IN SAID RANGE, THEREBY PRODUCING A TELOMER ACID FLUORIDE OF THE FORMULA
References Cited (Backward Citations)
US2904567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |