Patent US4425448A successfully refreshed from Google Patents.
US4425448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polytetrafluoroethylene resin with degradation retarder
Assignee: EIDP Inc
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Filing: 1982-05-20
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Granted: 1984-01-10
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Expires: 2002-05-20
Abstract
Abstract Zeolites, including ultramarine blue, retard the oxidative degradation of polytetrafluoroethylene resin (PTFE) at elevated temperatures. Coating compositions of PTFE, zeolites, acrylic resin and iron-containing pigments are provided.
Inventors
- 👤 Thomas P. Concannon
- 👤 Mitzie K. Rummel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:20
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08K; C08K3/00; C08K3/34; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
24 words
A composition consisting essentially of polytetrafluoroethylene resin and zeolite, said composition having a melt viscosity at 380° C. of at least 10 6 poises.
Claim 2
Dependent Claim
24 words
A composition consisting essentially of polytetrafluoroethylene resin and zeolite, said composition having a melt viscosity at 380° C. of at least 10 6 poises.
Claim 3
Dependent Claim
21 words
The composition of claim 1 in which the zeolite acts to retard oxidative degradation of the polytetrafluoroethylene resin at elevated temperatures.
Claim 4
Dependent Claim
26 words
The composition of claim 1 in which the zeolite contains sulfur or phosphorus in a crystallographic configuration which permits gradual release of the sulfur or phosphorus.
Claim 5
Dependent Claim
12 words
The composition of claim 1 in which the zeolite is ultramarine blue.
Claim 6
Dependent Claim
9 words
A coating composition comprising the composition of claim 1.
Claim 7
Dependent Claim
25 words
The coating composition of claim 5 also containing an unsaturated hydrocarbon polymer which decomposes at elevated temperatures but below the melting point of the polytetrafluoroethylene.
Claim 8
Dependent Claim
24 words
The coating composition of claim 6 in which the unsaturated hydrocarbon polymer acts as a coalescing aid to enhance film formation by the polytetrafluoroethylene.
Claim 9
Dependent Claim
30 words
The coating composition of claim 7 in which the unsaturated hydrocarbon polymer is an acrylic polymer and which also contains an oxidation catalyst to aid in decomposing the acrylic polymer.
Claim 10
Dependent Claim
18 words
The coating composition of claim 8 which also contains at least one of pigment, mica, and pigment-coated mica.
Claim 11
Dependent Claim
14 words
The coating composition of claim 9 in which the pigment includes an iron oxide.
Claim 12
Dependent Claim
13 words
The coating composition of claim 10 in which the zeolite is ultramarine blue.
References Cited (Backward Citations)
US2867605A
Cited
US3245946A
Cited
US3538028A
Cited
US3428595A
Cited
US4000100A
Cited
US3850867A
Cited
US4180609A
Cited
US4169083A
Cited
US4276214A
Cited
US4248763A
Cited
US4338226A
Cited
US4307010A
Cited
US4371656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |