US4488920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making a ceramic heat exchanger element
Assignee: Williams International Corp
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Filing: 1982-05-18
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Granted: 1984-12-18
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Expires: 2002-05-18
Abstract
Abstract The disclosure relates to a process for manufacturing a ceramic heat exchanger wherein a layer of ceramic material is deposited on a fugitive carbon form by chemical vapor deposition. The carbon form is thereafter burned away from the ceramic material to form a heat exchanger element. A plurality of heat exchanger elements are bonded to one another by chemical vapor deposition to form a homogeneous ceramic heat exchanger.
Inventors
- 👤 Louis J. Danis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:25
CPC Classifications
B; B32; B32B; B32B18/00; B28; B28B; B28B1/00; B28B1/002; B28B7/00; B28B7/34; B28B7/342; C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C04B35/58; C04B35/584; C04B37/00; C04B37/001; C04B37/003; C04B38/00; C04B38/008; F; F28; F28F; F28F21/00; F28F21/04; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/48; C04B2235/483; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/12; C04B2237/126; C04B2237/127; C04B2237/16; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/363; C04B2237/365; C04B2237/368; C04B2237/50; C04B2237/64; C04B2237/82
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
A process for manufacturing a ceramic heat exchanger comprising the steps of shaping a fugitive carbon form, depositing a layer of ceramic material on said carbon form by chemical vapor deposition, burning said carbon form away from said ceramic material to form a heat exchanger element, and bonding a plurality of said heat exchanger elements to one another to form said heat exchanger.
Claim 2
Dependent Claim
63 words
A process for manufacturing a ceramic heat exchanger comprising the steps of shaping a fugitive carbon form, depositing a layer of ceramic material on said carbon form by chemical vapor deposition, burning said carbon form away from said ceramic material to form a heat exchanger element, and bonding a plurality of said heat exchanger elements to one another to form said heat exchanger.
Claim 3
Dependent Claim
16 words
A process as set forth in claim 1 wherein said bonding step comprises chemical vapor deposition.
Claim 4
Dependent Claim
16 words
A process as set forth in claim 1 wherein said vapor deposition comprises disassociation of methyltrichlorosilane.
Claim 5
Dependent Claim
14 words
A process in accordance with claim 1 wherein the ceramic material comprises silicon carbide.
Claim 6
Dependent Claim
14 words
A process in accordance with claim 1 wherein the ceramic material comprises silicon nitride.
Claim 7
Dependent Claim
14 words
A process in accordance with claim 1 wherein said bonding step comprises ceramic brazing.
Claim 8
Dependent Claim
14 words
A process in accordance with claim 1 wherein the ceramic material comprises hafnium carbide.
Claim 9
Dependent Claim
14 words
A process in accordance with claim 1 wherein the ceramic material comprises a boride.
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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) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |