Patent US3654432A successfully refreshed from Google Patents.
US3654432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically heated catalytic air purifier
Assignee: Danfoss AS
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Filing: 1970-07-13
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Granted: 1972-04-04
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Expires: 1990-07-13
Abstract
Abstract The invention relates to air-treatment equipment for removing impurities from the air, particularly substances having an odor or taste and bacterial spores. The equipment includes a heating element, maintained at a high temperature, over which the air passes or is directed and this causes air borne particles to break down into odorless substances. The equipment includes a heat exchanger arrangement which serves to reduce the temperature of the heated air returned to the room or space from which the air was withdrawn. The heating element of the heating unit is made of electrically conducting silicon carbide having a thin coating of catalyst material.
Inventors
- 👤 Mogens Dyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:38
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; A; A61; A61L; A61L9/00; A61L9/015; A61L9/02; A61L9/03; F; F25; F25D; F25D17/00; F25D17/04; F25D17/042; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
Air-treatment apparatus for treating air borne particles comprising a heating unit having air passages and air-inlet and outlet means, a heat-exchange unit having first and second heat exchange passage means, said first heat-exchange passage means being connected to said heating unit air inlet means, said second heat exchange passage means being connected to said heating unit air-outlet means, said heating unit having a surface coating of a catalyst material and an operating temperature between 250* C. and 300* C., said heating unit contains electrically conducting silicon carbide as its major component, and said heat-exchange unit having tubes extending at right angles to said heating unit air passage.
Claim 2
Dependent Claim
107 words
Air-treatment apparatus for treating air borne particles comprising a heating unit having air passages and air-inlet and outlet means, a heat-exchange unit having first and second heat exchange passage means, said first heat-exchange passage means being connected to said heating unit air inlet means, said second heat exchange passage means being connected to said heating unit air-outlet means, said heating unit having a surface coating of a catalyst material and an operating temperature between 250* C. and 300* C., said heating unit contains electrically conducting silicon carbide as its major component, and said heat-exchange unit having tubes extending at right angles to said heating unit air passage.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |