US2957032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorodimethylcyclobutanes
Assignee: Pennwalt Corp
•
Filing: 1957-12-13
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Granted: 1960-10-18
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Expires: 1977-12-13
Abstract
No abstract record available.
Inventors
- 👤 Hauptschein Murray
- 👤 Braid Milton
- 👤 Francis E Lawlor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:06
CPC Classifications
C; C07; C07C; C07C23/00; C07C23/02; C07C23/06; C07C17/00; C07C17/26; C07C17/272; C07C17/278; C07C17/281
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
4 words
COMPOUNDS HAVING THE STRUCTURE
Claim 2
Dependent Claim
4 words
COMPOUNDS HAVING THE STRUCTURE
Claim 3
Independent Claim
39 words
A METHOD FOR MAKING A DIMER OF PERFLUOROPROPENE WHICH COMPRISES HEATING PERFLUOROPROPENE TO BETWEEN ABOUT 240*C. AND ABOUT 800*C., AT A PERFLUOROPROPENE PRESSURE FROM ABOUT 10 P.S.I.G. TO ABOUT 100,000 P.S.I.G. IN THE SUBSTANTIAL ABSENCE OF ANY OTHER REACTANT.
Claim 4
Independent Claim
39 words
A METHOD FOR MAKING A DIMER OF PERFLUOROPROPENE WHICH COMPRISES HEATING PERFLUOROPROPENE TO BETWEEN ABOUT 240*C. AND ABOUT 800*C., AT A PERFLUOROPROPENE PRESSURE FROM ABOUT 10 P.S.I.G. TO ABOUT 100,000 P.S.I.G. IN THE SUBSTANTIAL ABSENCE OF ANY OTHER REACTANT.
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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |