US4702960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment for carbon and product
Assignee: Specialty Materials Inc
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Filing: 1980-07-30
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Granted: 1987-10-27
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Expires: 2000-07-30
Abstract
Abstract The invention relates to a surface treatment for a carbon surface. A carbon-rich silicon carbide layer is applied over the carbon surface. The ratio of silicon to carbon in the carbon-rich layer varies from zero at the carbon surface interface to greater than zero and preferably 0.3 to 0.5 on the surface of the carbon-rich layer remote from the interface. A preferred method of making the silicon carbide layer is also presented.
Inventors
- 👤 Abraham O. Ogman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:35
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/32; C23C16/325; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5053; C04B41/5057; C04B41/5059; D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/125; D01F11/126; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/292; Y10T428/298; Y10T428/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
A surface treatment for carbon comprising: supplying a first surface comprising essentially pure carbon; and depositing a single layer of carbon-rich silicon carbide overlying said first surface, the ratio of silicon to carbon of said carbon-rich layer varies continuously from zero at the interface with said first surface to greater than zero on the surface of the carbon-rich layer remote from said interface for enhancing the wettability of the carbon surface and the depth of the carbon-rich silicon layer is 0.25 microns ±20 percent.
Claim 2
Dependent Claim
84 words
A surface treatment for carbon comprising: supplying a first surface comprising essentially pure carbon; and depositing a single layer of carbon-rich silicon carbide overlying said first surface, the ratio of silicon to carbon of said carbon-rich layer varies continuously from zero at the interface with said first surface to greater than zero on the surface of the carbon-rich layer remote from said interface for enhancing the wettability of the carbon surface and the depth of the carbon-rich silicon layer is 0.25 microns ±20 percent.
Claim 3
Dependent Claim
83 words
A filamentary reinforcement for metal matrix composite materials comprising: a filamentary reinforcement having a carbon exterior surface with a single carbon-rich silicon carbide overlayer where the ratio of silicon to carbon varies continuously from zero at the interface in the carbon exterior surface of the filamentary reinforcement to a value intermediate zero and one at the exterior surface of the carbon-rich layer for enhancing the wettability of the carbon surface and the depth of the carbon-rich silicon layer is 0.25 microns ±20 percent.
Claim 4
Dependent Claim
83 words
A filamentary reinforcement for metal matrix composite materials comprising: a filamentary reinforcement having a carbon exterior surface with a single carbon-rich silicon carbide overlayer where the ratio of silicon to carbon varies continuously from zero at the interface in the carbon exterior surface of the filamentary reinforcement to a value intermediate zero and one at the exterior surface of the carbon-rich layer for enhancing the wettability of the carbon surface and the depth of the carbon-rich silicon layer is 0.25 microns ±20 percent.
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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) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |