Patent US4991822A successfully refreshed from Google Patents.
US4991822A
Expired / Lapsed
US
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Valve having ceramic valve bodies with low friction coatings
Assignee: Grohe Water Technology AG and Co KG
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Filing: 1988-11-14
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Granted: 1991-02-12
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Expires: 2008-11-14
Abstract
Abstract In a valve, especially for a shut-off or regulating means, having of a plate-like valve body of a metal or nonmetallic material having at least one layer of hard substance applied to the valve body, the coating consists of an alloy of silicon and/or carbon, preferably of Si x C 1-x (wherein -x has a value of 0 to 1), and is applied to the valve body by the method of plasma CVD or plasma polymerization, monomers (gases or gas mixtures which contain the atoms which are to form the hard coating) are used, which contain carbon or carbon and silicon.
Inventors
- 👤 Knut Enke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:33
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/4505; C04B41/4529; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/32; C23C16/325; F; F16; F16K; F16K25/00; F16K25/005; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86815; Y10T137/86823
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
44 words
A valve, especially for shut-off and regulating means, comprising a pair of ceramic valve bodies having respective sealing surfaces which slide against each other, each valve body being coated with a hard carbonaceous coating comprising a first layer containing carbon with a silicon admixture.
Claim 2
Dependent Claim
44 words
A valve, especially for shut-off and regulating means, comprising a pair of ceramic valve bodies having respective sealing surfaces which slide against each other, each valve body being coated with a hard carbonaceous coating comprising a first layer containing carbon with a silicon admixture.
Claim 3
Dependent Claim
17 words
A valve as in claim 1 wherein said coating comprises an additional layer of different silicon content.
Claim 4
Dependent Claim
15 words
A valve as in claim 2 wherein said additional layer is a silicon-free carbon coating.
Claim 5
Dependent Claim
15 words
A valve as in claim 1 wherein said coating is an amorphous coating containing hydrogen.
Claim 6
Dependent Claim
11 words
A valve as in claim 1 wherein said coating contains oxygen.
Claim 7
Dependent Claim
18 words
A valve as in claim 1 wherein at least one of said ceramic valve bodies is aluminum oxide.
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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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |