US4426411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating a steel pressure roll for use in a pressure-fixation apparatus
Assignee: Individual
•
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 15:48
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.
References Cited (Backward Citations)
US1228178A
Cited
US3063763A
Cited
US3141593A
Cited
US3647525A
Cited
US3317411A
Cited
US3343484A
Cited
US3874843A
Cited
US3874894A
Cited
US4065365A
Cited
US3990391A
Cited
DE2607271C2
Cited
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 |