US4039497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polytetrafluoroethylene based coating compositions
Assignee: Produits Chimiques Ugine Kuhlmann
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Filing: 1975-10-21
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Granted: 1977-08-02
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Expires: 1995-10-21
Abstract
Abstract The present invention relates to polytetrafluoroethylene based coating compositions containing polyvinylidene fluoride and lithia (lithium hydroxide). These compositions make it possible to make polytetrafluoroethylene coatings which adhere strongly to various types of substrata.
Inventors
- 👤 Maurice Troussier
- 👤 Huynh Van Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:01
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L27/16; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
24 words
A coating composition comprising: a. polytetrafluoroethylene in the dispersed form; b. polyvinylidene fluoride in the dispersed form; c. lithia; and d. an aqueous medium.
Claim 2
Dependent Claim
24 words
A coating composition comprising: a. polytetrafluoroethylene in the dispersed form; b. polyvinylidene fluoride in the dispersed form; c. lithia; and d. an aqueous medium.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein the polytetrafluoroethylene and the polyvinylidene fluoride together represent from about 10 to 50% by weight of the total composition.
Claim 4
Dependent Claim
25 words
The composition of claim 2 wherein the polyvinylidene fluoride represents from about 5 to 25% by weight of the total of polytetrafluoroethylene and polyvinylidene fluoride.
Claim 5
Dependent Claim
24 words
The composition of claim 1 wherein the lithia represents from about 0.2 to 2% by weight of the total of polytetrafluoroethylene and polyvinylidene fluoride.
Claim 6
Dependent Claim
29 words
Articles of manufacture having adhered thereto and dried thereon a coating composition comprising: a. polytetrafluoroethylene in the dispersed form; b. polyvinylidene fluoride in the dispersed form; and c. lithia.
Claim 7
Dependent Claim
29 words
Articles of manufacture having adhered thereto and dried thereon a coating composition comprising: a. polytetrafluoroethylene in the dispersed form; b. polyvinylidene fluoride in the dispersed form; and c. lithia.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |