US4040804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat and moisture exchanger
Assignee: Halm Instrument Co Inc
•
Filing: 1975-05-23
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Granted: 1977-08-09
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Expires: 1995-05-23
Abstract
Abstract A heat and moisture exchanger consists of a folded sheet of water permeable paper having a plurality of folds. Separators are placed between said folds to provide air passages. Air is directed in one direction through the folds on one side of said folded paper. The return air flows in the opposite direction through said folds on the other side of said folded paper. Water and heat are transferred through the paper from one air stream to the other air stream flowing in the opposite direction.
Inventors
- 👤 Henry Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:51
CPC Classifications
F; F24; F24F; F24F12/00; F24F12/001; F24F12/006; F24F3/00; F24F3/12; F24F3/14; F24F3/147; F28; F28D; F28D21/00; F28D21/0015; F28D9/00; F28D9/0025; F24F2003/1435; Y; Y02; Y02B; Y02B30/00; Y02B30/56; Y10; Y10S; Y10S165/00; Y10S165/909
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
Heat and moisture exchanger means comprising a folded sheet of heat and moisture permeable paper having a plurality of folds, means between said folds to separate said folds, means closing the end of the folds, impermeable means connected to and surrounding the central part of said folded sheet to support said folded sheet and to provide a plurality of air passages on one side of the sheet interleaved in juxtaposition with a plurality of air passages on the other side of the sheet, means connected to the folded sheet to direct air in one direction through said folds on one side of said folded paper, the return air flowing in the opposite direction through said folds on the other side of said folded paper whereby water and heat are transferred through the paper between one air stream and the other air stream flowing in the opposite direction.
Claim 2
Dependent Claim
147 words
Heat and moisture exchanger means comprising a folded sheet of heat and moisture permeable paper having a plurality of folds, means between said folds to separate said folds, means closing the end of the folds, impermeable means connected to and surrounding the central part of said folded sheet to support said folded sheet and to provide a plurality of air passages on one side of the sheet interleaved in juxtaposition with a plurality of air passages on the other side of the sheet, means connected to the folded sheet to direct air in one direction through said folds on one side of said folded paper, the return air flowing in the opposite direction through said folds on the other side of said folded paper whereby water and heat are transferred through the paper between one air stream and the other air stream flowing in the opposite direction.
Claim 3
Dependent Claim
17 words
Apparatus as in claim 1, wherein the folded paper is held by a band encircling the folds.
Claim 4
Dependent Claim
38 words
Apparatus as in claim 1, having a frame mounted in a wall, said heat exchanger means being mounted in said frame, and air moving means mounted on said frame to move air through the heat and moisture exchanger.
Claim 5
Dependent Claim
17 words
Apparatus as in claim 1, wherein said folds are separated with spaced members adhering to the paper.
Claim 6
Dependent Claim
13 words
Apparatus as in claim 4, wherein the spaced members are grains of sand.
References Cited (Backward Citations)
US2973828A
Cited
US3258900A
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US3666007A
Cited
US3640340A
Cited
US3925021A
Cited
US3735559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |