Patent US3799250A successfully refreshed from Google Patents.
US3799250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air treatment equipment
Assignee: Danfoss AS
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Filing: 1971-06-30
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Granted: 1974-03-26
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Expires: 1991-06-30
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WHICH SERVES TO REDUCE THE TEMPERATURE OF THE HEATED AIR RETURNED TO THE ROOM OR SPACE FROM WHICH THE AIR WAS WITHDRAWN.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 OE ELECTRICALLY CONDUCTING SILICON CARBIDE HAVING A THIN COATING OF CATALYST MATERIAL.
Inventors
- 👤 M Dyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:06
CPC Classifications
F; F24; F24F; F24F8/00; F24F8/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |