Patent US4426411A successfully refreshed from Google Patents.
US4426411A
Expired / Lapsed
US
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Method of fabricating a steel pressure roll for use in a pressure-fixation apparatus
Assignee: Individual
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Filing: 1980-12-11
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Granted: 1984-01-17
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Expires: 2000-12-11
Abstract
Abstract A hardened and chrome plated steel roller is shot-blasted with sharp-edged particles (e.g. of 300-400 mesh) to provide sharp-edged recesses on the roll surface, and then shot-blasted a second time with steel balls (e.g. of 30-40 microns) to round the sharp edges of the recesses, to provide a smooth, but low luster, surface.
Inventors
- 👤 Yoshitaka Sasaki
- 👤 Keitaro Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:57
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2092
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
92 words
A method of treating the surface of a steel pressure roll for use in pressure-fixation apparatus of electrophotographic duplicating apparatus for reducing glare of the pressure-fixed image comprising the steps of: a. hardening the surface of the steel pressure roll; b. hard chrome-plating the hardened surface; c. first shot-blasting the chrome-plated surface with sharp-edged hard particles, said first-shot blasting step for providing a surface substantially covered with sharp-edged recesses; and d. second shot-blasting the first shot-blasted surface with steel balls, said second shot-blasting step for rounding the sharp edges of the recesses.
Claim 2
Independent Claim
92 words
A method of treating the surface of a steel pressure roll for use in pressure-fixation apparatus of electrophotographic duplicating apparatus for reducing glare of the pressure-fixed image comprising the steps of: a. hardening the surface of the steel pressure roll; b. hard chrome-plating the hardened surface; c. first shot-blasting the chrome-plated surface with sharp-edged hard particles, said first-shot blasting step for providing a surface substantially covered with sharp-edged recesses; and d. second shot-blasting the first shot-blasted surface with steel balls, said second shot-blasting step for rounding the sharp edges of the recesses.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein the range of size of said sharp-edged hard particles is 300 to 400 mesh and wherein the range of size of said steel balls is 30 to 40 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |