US3274989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air heater
Assignee: Preway Inc
•
Filing: 1963-12-31
•
Granted: 1966-09-27
•
Expires: 1983-12-31
Abstract
No abstract record available.
Inventors
- 👤 Kenneth S Jenson
- 👤 Frederick W Suhr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:41
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/001; F24C15/002; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
AN AIR HEATER, COMPRISING: A HOUSING HAVING AN EXTERIOR WALL DEFINING AT LEAST AN AIR INLET AND AN AIR OUTLET FOR SAID AIR HEATER; MEANS DEFINING AN AIR HEATING CHAMBER WITHIN SAID HOUSING SO THAT INTAKE AIR IS DIRECTED THROUGH SEPARATE BRANCH FLOW PATHS FROM SAID INLET, ONE OF SAID FLOW PATHS DEFINING A BLANKET OF INSULATING AIR BETWEEN SAID EXTERIOR WALL AND SAID HEATING CHAMBER, THE OTHER OF SAID FLOW PATHS DEFINING A GENERALLY DIRECT ROUTE FROM SAID INLET, THROUGH SAID HEATING CHAMBER, TO SAID OUTLET; A BLOWER MOUNTED IN SAID HOUSING FOR DRAWING AIR IN FROM A ROOM, THROUGH SAID SEPARATE FLOW PATHS AND DISCHARGED
Claim 2
Dependent Claim
107 words
AN AIR HEATER, COMPRISING: A HOUSING HAVING AN EXTERIOR WALL DEFINING AT LEAST AN AIR INLET AND AN AIR OUTLET FOR SAID AIR HEATER; MEANS DEFINING AN AIR HEATING CHAMBER WITHIN SAID HOUSING SO THAT INTAKE AIR IS DIRECTED THROUGH SEPARATE BRANCH FLOW PATHS FROM SAID INLET, ONE OF SAID FLOW PATHS DEFINING A BLANKET OF INSULATING AIR BETWEEN SAID EXTERIOR WALL AND SAID HEATING CHAMBER, THE OTHER OF SAID FLOW PATHS DEFINING A GENERALLY DIRECT ROUTE FROM SAID INLET, THROUGH SAID HEATING CHAMBER, TO SAID OUTLET; A BLOWER MOUNTED IN SAID HOUSING FOR DRAWING AIR IN FROM A ROOM, THROUGH SAID SEPARATE FLOW PATHS AND DISCHARGED
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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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |