US5236784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing material and plastic bearing
Assignee: Nidec Instruments Corp
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Filing: 1992-05-01
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Granted: 1993-08-17
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Expires: 2012-05-01
Abstract
Abstract A bearing material mainly comprising plastics and a plastic bearing made thereof. The bearing material is composed of 30 to 98 wt % of glassy carbon and 70 to 2 wt % of plastics, and has persistent, excellent abrasion resistance, sliding properties, and heat resistance.
Inventors
- 👤 Toshihiro Kobayashi
- 👤 Tokuhisa Tsutsui
- 👤 Yuuki Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:02
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; F16C33/16; F16C2208/00; F16C2208/20; F16C2208/58; F16C2208/60; F16C2208/66; F16C2208/80; F16C2208/86; F16C2208/90; F16C2223/00; F16C2223/10; F16C2223/12; F16C2240/00; F16C2240/40; F16C2240/48; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/907; Y10S384/908; Y10S384/909; Y10S384/91; Y10T; Y10T428/00; Y10T428/25; Y10T428/30; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A plastic bearing, which includes a plastic layer molded integrally with an inner periphery of a metal holder for tight adhesion therewith, wherein said plastic layer has a slidable face in contact with a rotary metal shaft, wherein said plastic layer consists essentially of about 50% by weight to about 90% by weight of vitreous carbon and 50% by weight to about 10% by weight of plastic, as well as about 1 to 7% by weight of the total amount of vitreous carbon and plastic of a surfactant or coupling agent, and optionally wherein said plastic layer further contains about 5-20% by weight of the total amount of vitreous carbon and plastic of a lubricant for increasing the slidability of its slidable face, the vitreous carbon being in powder form having a mean particle size of about 10 to 30 μm.
Claim 2
Dependent Claim
141 words
A plastic bearing, which includes a plastic layer molded integrally with an inner periphery of a metal holder for tight adhesion therewith, wherein said plastic layer has a slidable face in contact with a rotary metal shaft, wherein said plastic layer consists essentially of about 50% by weight to about 90% by weight of vitreous carbon and 50% by weight to about 10% by weight of plastic, as well as about 1 to 7% by weight of the total amount of vitreous carbon and plastic of a surfactant or coupling agent, and optionally wherein said plastic layer further contains about 5-20% by weight of the total amount of vitreous carbon and plastic of a lubricant for increasing the slidability of its slidable face, the vitreous carbon being in powder form having a mean particle size of about 10 to 30 μm.
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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) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |