US3980506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing highly wear-resistant, undistorted, axially symmetrical parts
Assignee: Individual
•
Filing: 1974-01-31
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Granted: 1976-09-14
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Expires: 1994-01-31
Abstract
Abstract A process for manufacturing highly wear-resistant, undistorted, axially symmetrical parts formed of a hardenable metal wherein the parts are subjected, in succession and while being rotated, to a surface pressure polishing process and to a surface hardening process without any further treatment.
Inventors
- 👤 Franz Josef Overkott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:56
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/02; C21D7/04; C21D7/08; C21D9/00; C21D9/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A process for manufacturing highly wear-resistant, undistorted, axially symmetrical elongated chromium-containing martensitic steel parts comprising the steps of: rotating the parts about their longitudinal axis at a speed of about 500 to 1000 revolutions per minute, subjecting the rotating part to a surface pressure polishing process to increase the strength to about 110 Kg/mm 2 , and subjecting the polished rotating part to a surface hardening process which includes exposure to a surface-hardness-producing gas, selected from the group consisting of carbonizing and nitriding gas or mixtures thereof at a temperature above the A 3 temperature of the iron-carbon equilibrium diagram.
Claim 2
Dependent Claim
100 words
A process for manufacturing highly wear-resistant, undistorted, axially symmetrical elongated chromium-containing martensitic steel parts comprising the steps of: rotating the parts about their longitudinal axis at a speed of about 500 to 1000 revolutions per minute, subjecting the rotating part to a surface pressure polishing process to increase the strength to about 110 Kg/mm 2 , and subjecting the polished rotating part to a surface hardening process which includes exposure to a surface-hardness-producing gas, selected from the group consisting of carbonizing and nitriding gas or mixtures thereof at a temperature above the A 3 temperature of the iron-carbon equilibrium diagram.
Claim 3
Dependent Claim
26 words
A process as set forth in claim 1 wherein said gas to which the parts are exposed during the case hardening process is a carbonizing gas.
Claim 4
Dependent Claim
26 words
A process as set forth in claim 1 wherein said gas to which the parts are exposed in said case hardening process comprises a nitriding gas.
Claim 5
Dependent Claim
84 words
A process for manufacturing highly wear-resistant, undistorted, axially symmetrical elongated martensitic steel parts containing 12% to 18% chromium and 0.4% to 0.6% carbon comprising the steps of: rotating the parts about their longitudinal axis at a speed of about 500 to 1000 revolutions per minute, subjecting the rotating part to a surface pressure polishing process to increase the strength, and subjecting the polished rotating part to a surface hardening process which includes exposure to a surface-hardness-producing gas so as to case harden the workpiece.
Claim 6
Dependent Claim
84 words
A process for manufacturing highly wear-resistant, undistorted, axially symmetrical elongated martensitic steel parts containing 12% to 18% chromium and 0.4% to 0.6% carbon comprising the steps of: rotating the parts about their longitudinal axis at a speed of about 500 to 1000 revolutions per minute, subjecting the rotating part to a surface pressure polishing process to increase the strength, and subjecting the polished rotating part to a surface hardening process which includes exposure to a surface-hardness-producing gas so as to case harden the workpiece.
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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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |