US2980740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
alpha, alpha, omega-trihydroperfluoroalkanes
Assignee: EIDP Inc
•
Filing: 1958-06-19
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Granted: 1961-04-18
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Expires: 1978-06-19
Abstract
No abstract record available.
Inventors
- 👤 William R Hasek
- 👤 Jr Alfred C Haven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:51
CPC Classifications
C; C07; C07C; C07C19/00; C07C19/08; C07C17/00; C07C17/093; C07C17/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
THE PROCESS WHICH COMPRISES REACTING AN ALCOHOL OF THE FORMULA H(CF2)NCH2OH, WHEREIN N IS A POSITIVE INTEGER WITH A VALUE OF BETWEEN 1 AND 24, WITH A SULFUR TETRAFLUORIDE AND THEREBY PREPARING A POLYFLUOROALKANE.
Claim 2
Dependent Claim
34 words
THE PROCESS WHICH COMPRISES REACTING AN ALCOHOL OF THE FORMULA H(CF2)NCH2OH, WHEREIN N IS A POSITIVE INTEGER WITH A VALUE OF BETWEEN 1 AND 24, WITH A SULFUR TETRAFLUORIDE AND THEREBY PREPARING A POLYFLUOROALKANE.
Claim 3
Dependent Claim
33 words
A POLYFLUOROALKANE CONSISTING SOLELY OF BETWEEN 3 AND 25 CARBONS, FLUROINE, AND THREE HYDROGENS, SAID HYDROGENS BEING BONDED TO THE TERMINAL CARBONS OF THE POLYFLUROALKANE, EACH TERMINAL CARBON BEARING AT LEAST ONE HYDROGEN.
Claim 4
Dependent Claim
33 words
A POLYFLUOROALKANE CONSISTING SOLELY OF BETWEEN 3 AND 25 CARBONS, FLUROINE, AND THREE HYDROGENS, SAID HYDROGENS BEING BONDED TO THE TERMINAL CARBONS OF THE POLYFLUROALKANE, EACH TERMINAL CARBON BEARING AT LEAST ONE HYDROGEN.
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |