Patent US3121053A successfully refreshed from Google Patents.
Patent US4789026A successfully refreshed from Google Patents.
US4789026A
Expired / Lapsed
US
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Polished surface capillary grooves
Assignee: Aavid Thermacore Inc
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Filing: 1987-06-26
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Granted: 1988-12-06
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Expires: 2007-06-26
Abstract
Abstract Capillary grooves in a heat pipe which are specifically constructed to suppress boiling. Conventionally shaped grooves are constructed with highly polished surfaces. The high polish discourages vapor bubbles which otherwise interfere with the liqud transport function of the arteries. A method of constructing the highly polished grooves by vapor deposition onto matching mandrels is also disclosed.
Inventors
- 👤 Brian E. Shank
- 👤 Robert M. Shaubach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:55
CPC Classifications
F; F28; F28D; F28D15/00; F28D15/02; F28D15/04; F28D15/046
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
37 words
An improved heat pipe comprising a heat pipe casing with grooves formed in the inside surface of the heat pipe casing wherein the surfaces in the grooves have roughness measure of no more than 8 microinches R.M.S.
Claim 2
Dependent Claim
37 words
An improved heat pipe comprising a heat pipe casing with grooves formed in the inside surface of the heat pipe casing wherein the surfaces in the grooves have roughness measure of no more than 8 microinches R.M.S.
Claim 3
Dependent Claim
18 words
The improved heat pipe of claim 1 wherein the junctions between the surfaces of the grooves are rounded.
Claim 4
Dependent Claim
23 words
The improved heat pipe of claim 1 wherein lands between the grooves have a roughness measure of no more than 8 microinches R.M.S.
Claim 5
Dependent Claim
22 words
The improved heat pipe of claim 1 wherein lands between the grooves have a roughness measure of greater than 8 microinches R.M.S.
References Cited (Backward Citations)
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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) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |