US3970627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorocarbon polymer coating compositions containing mica particles
Assignee: EIDP Inc
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Filing: 1973-09-24
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Granted: 1976-07-20
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Expires: 1993-09-24
Abstract
Abstract Aqueous fluorocarbon polymer coating compositions which contain mica particles or mica particles coated with a pigment such as titanium dioxide are provided. These compositions are useful for coating substrates, especially metallic cookware and bakeware to give a non-stick finish of improved post oil adhesion.
Inventors
- 👤 Herman Ernest Seymus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:46
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; C; C08; C08K; C08K3/00; C08K3/34; C08K3/346; C08K3/36; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
An aqueous coating composition consisting essentially of: a. 40-93%, by weight of the total of (a), (b) and (c) solids, of a particulate fluoropolymer, b. 5-35%, by weight of the total of (a), (b) and (c) solids, of colloidal silica stabilized with sodium ions, or a mixture of said silica with a water-soluble alkali metal silicate, in a ratio in the range between 25:75 and 90:10 respectively, c. 2-25%, by weight of the total of (a), (b) and (c) solids, of mica particles coated with a pigment, and d. water as a carrier.
Claim 2
Dependent Claim
93 words
An aqueous coating composition consisting essentially of: a. 40-93%, by weight of the total of (a), (b) and (c) solids, of a particulate fluoropolymer, b. 5-35%, by weight of the total of (a), (b) and (c) solids, of colloidal silica stabilized with sodium ions, or a mixture of said silica with a water-soluble alkali metal silicate, in a ratio in the range between 25:75 and 90:10 respectively, c. 2-25%, by weight of the total of (a), (b) and (c) solids, of mica particles coated with a pigment, and d. water as a carrier.
Claim 3
Dependent Claim
38 words
The composition of claim 1 wherein the particles in (c) are about 5-15% by weight of the total solids and greater than 80% of the particles are in the range of about 4 to 50 microns in size.
Claim 4
Dependent Claim
13 words
The composition of claim 2 wherein the fluorocarbon polymer in (a) is polytetrafluoroethylene.
Claim 5
Dependent Claim
17 words
The composition of claim 3 wherein the particles in (c) are mica particles coated with titanium dioxide.
Claim 6
Dependent Claim
30 words
The composition of claim 4 wherein the solids of (a), (b) and (c) are about 50-90% by weight (a), about 5-35% by weight (b) and about 5-15% by weight (c).
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |