US4626608A
Expired / Lapsed
US
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Persistent perfluoroalkyl free radicals useful as polymerization catalyst
Assignee: Tanabe Pharma Corp
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Filing: 1983-04-05
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Granted: 1986-12-02
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Expires: 2003-04-05
Abstract
Abstract Novel persistent perfluorinated free radicals are disclosed, which upon thermal decomposition yield free radicals which can be used to polymerize polymerizable monomers containing ethylenic unsaturation.
Inventors
- 👤 Kirby V. Scherer, Jr.
- 👤 Taizo Ono
- 👤 Kouichi Yamanouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:36
CPC Classifications
C; C08; C08F; C08F4/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
7 words
A free radical having the formula ##STR12##
Claim 2
Dependent Claim
7 words
A free radical having the formula ##STR12##
Claim 3
Dependent Claim
7 words
A free radical having the formula ##STR13##
Claim 4
Dependent Claim
7 words
A free radical having the formula ##STR13##
References Cited (Backward Citations)
US3962358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |