Patent US4149016A successfully refreshed from Google Patents.
US4149016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluoroethers
Assignee: United States Department of the Air Force
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Filing: 1977-11-16
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Granted: 1979-04-10
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Expires: 1997-11-16
Abstract
Abstract A method for synthesizing perfluoropolyethers by effecting addition reactions under low temperature photolysis between perfluoroolefins, perfluorodialkyl peroxides and fluoroxyperfluoroalkanes resulting in the snythesis of new compounds.
Inventors
- 👤 Madeline S. Toy
- 👤 Roger S. Stringham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:09
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/123
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
4 words
As a compound, 2,2'-perfluorodi(methoxycyclopentyl).
Claim 2
Dependent Claim
4 words
As a compound, 2,2'-perfluorodi(methoxycyclopentyl).
Claim 3
Dependent Claim
4 words
As a compound, 2,2'-perfluorodi(methoxycyclohexyl.
Claim 4
Dependent Claim
4 words
As a compound, 2,2'-perfluorodi(methoxycyclohexyl.
References Cited (Backward Citations)
US2982786A
Cited
US3242218A
Cited
US3397191A
Cited
US3514487A
Cited
US3435078A
Cited
US4024192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |