US3940518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bake technique for manufacturing tetrafluoroethylene coated rolls
Assignee: Xerox Corp
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Filing: 1974-04-26
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Granted: 1976-02-24
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Expires: 1994-04-26
Abstract
Abstract A method for preparing polymer coated rolls for use in a xerographic reproducing apparatus is given whereby coatings of tetrafluoroethylene primer and enamel are applied, dried at low temperatures and baked at temperatures below the fusion temperature followed by a final heating step to fuse the tetrafluoroethylene enamel coating.
Inventors
- 👤 Edward F. Bowler, Jr.
- 👤 Joseph M. Stupin, Jr.
- 👤 Edward G. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:25
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
A method for manufacturing a polymer coated roll for use in a xerographic reproducing apparatus comprising: applying to the surface of the roll a tetrafluoroethylene primer; drying the primer; heating the primer-coated roll until the primer is baked; applying to the surface of said roll a liquid coating consisting essentially of tetrafluoroethylene enamel; drying said coating; baking the coated roll at a temperature below the fusion temperature of tetrafluoroethylene resin; applying at least one more additional liquid coating of tetrafluoroethylene enamel, drying, and baking of said coating after each application at a temperature below the fusion temperature of tetrafluoroethylene resin until the desired thickness of tetrafluoroethylene enamel on the surface is attained; and heating the coated roll at a temperature sufficient to cause fusion of the tetrafluoroethylene coating.
Claim 2
Independent Claim
128 words
A method for manufacturing a polymer coated roll for use in a xerographic reproducing apparatus comprising: applying to the surface of the roll a tetrafluoroethylene primer; drying the primer; heating the primer-coated roll until the primer is baked; applying to the surface of said roll a liquid coating consisting essentially of tetrafluoroethylene enamel; drying said coating; baking the coated roll at a temperature below the fusion temperature of tetrafluoroethylene resin; applying at least one more additional liquid coating of tetrafluoroethylene enamel, drying, and baking of said coating after each application at a temperature below the fusion temperature of tetrafluoroethylene resin until the desired thickness of tetrafluoroethylene enamel on the surface is attained; and heating the coated roll at a temperature sufficient to cause fusion of the tetrafluoroethylene coating.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein drying is accomplished at ambient temperature.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein drying is accomplished at a temperature of from about 70°F. to about 80°F.
Claim 5
Dependent Claim
20 words
The method of claim 3 wherein drying is accomplished at between about 10 percent and about 60 percent relative humidity.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the primer is baked at between about 400°F. and about 550°F.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the primer is baked at about 475°F. for between about 10 and about 30 minutes.
Claim 8
Dependent Claim
31 words
The method of claim 1 wherein the tetrafluoroethylene enamel is baked at a temperature of between about 600°F. and below the fusion temperature for between about 10 and about 30 minutes.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein the tetrafluoroethylene enamel is baked at a temperature of about 650°F. for about 20 minutes.
Claim 10
Dependent Claim
19 words
The method of claim 1 wherein the tetrafluoroethylene coating is fused at a temperature of between 725°F. and 800°F.
Claim 11
Dependent Claim
17 words
The method of claim 1 wherein the tetrafluoroethylene coating is fused at a temperature of about 750°F.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |