Patent US4448757A successfully refreshed from Google Patents.
US4448757A
Expired / Lapsed
US
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Process for removing contaminants from compressed air
Assignee: Deltech Engineering Inc
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Filing: 1982-04-26
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Granted: 1984-05-15
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Expires: 2002-04-26
Abstract
Abstract An air purification system chills incoming air to condense water and toxic gases, adsorbs toxic molecules, reheats the air to reduce its relative humidity, and then converts oxidizable contaminants into carbon dioxide with an oxidation catalyst.
Inventors
- 👤 James W. Barnwell
- 👤 Ernest J. Breton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:41
CPC Classifications
B; B01; B01D; B01D51/00; B01D51/10; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/864
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
72 words
A process for purifying compressed air used for human breathing comprising: (a) cooling of the compressed air to condense water and other condensable vapors in the compressed gas, (b) removing condensed water and other condensable vapors from the compressed air, (c) reheating the compressed air to reduce its relative humidity to below 5%, and (d) passing the reheated compressed air through one or more catalysts to convert carbon monoxide to carbon dioxide.
Claim 2
Dependent Claim
72 words
A process for purifying compressed air used for human breathing comprising: (a) cooling of the compressed air to condense water and other condensable vapors in the compressed gas, (b) removing condensed water and other condensable vapors from the compressed air, (c) reheating the compressed air to reduce its relative humidity to below 5%, and (d) passing the reheated compressed air through one or more catalysts to convert carbon monoxide to carbon dioxide.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the relative humidity of the compressed air is further controlled by reducing the pressure thereof after reheating.
Claim 4
Dependent Claim
38 words
The process of claim 1 wherein cooling of the compressed air is accomplished in the evaporation stage of a compression type refrigeration means and heating of the air is accomplished in the condensation stage of the refrigeration means.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the relative humidity of the compressed air passing through the catalyst is further controlled by heating the catalyst.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |