US4650592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self lubricating silicon nitride article
Assignee: Osram Sylvania Inc
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Filing: 1985-05-28
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Granted: 1987-03-17
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Expires: 2005-05-28
Abstract
Abstract An article is disclosed comprising particles of a silicon nitride based material and a lubricating material, the lubricating material occupying interconnected spaces within the article, the spaces being at least about 3% by volume of the article.
Inventors
- 👤 Robert J. Dobbs
- 👤 David E. Thomas
- 👤 Dale E. Wittmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:35
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B41/45; C04B41/46; C04B41/47; C04B41/478; C04B41/50; C04B41/5053; C04B41/80; C04B41/81; C04B41/82; C04B41/85; C04B41/87; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/043
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
40 words
An article comprising particles made of a silicon nitride based material and a lubricating material, and lubricating material occupying interconnected spaces within said article, said spaces being at least from about 3% to about 10.5% by volume of said article.
Claim 2
Dependent Claim
40 words
An article comprising particles made of a silicon nitride based material and a lubricating material, and lubricating material occupying interconnected spaces within said article, said spaces being at least from about 3% to about 10.5% by volume of said article.
Claim 3
Dependent Claim
31 words
An article of claim 1 wherein said silicon nitride based material consists essentially of in percent by weight about 2% aluminum oxide, about 6% yttrium oxide, and the balance silicon nitride.
Claim 4
Dependent Claim
36 words
An article of claim 1 wherein said particles have a density of at least about 96% of the theoretical density, and wherein the total porosity of said article is about 30% by volume of said article.
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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |