US3301473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blower fan construction and impellers therefor
Assignee: Bell and Howell Co
•
Filing: 1965-04-12
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Granted: 1967-01-31
•
Expires: 1985-04-12
Abstract
No abstract record available.
Inventors
- 👤 Frank L Weninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:02
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/38; F04D29/388; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49321; Y10T403/00; Y10T403/44; Y10T403/447; Y10T403/70; Y10T403/7001; Y10T403/7003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A BLOWER FAN CONSTRUCTION HAVING A DRIVABLE SHAFT DEFINING AN AXIS OF ROTATION, THE IMPROVEMENT COMPRISING: A PAIR OF ASSOCIATED IMPELLERS HAVING OPPOSED FAN FINS AND MEDIAL HUB PORTIONS; SAID HUB PORTIONS DEFINING SHAFT SEMI-ENCIRCLING MEMBERS CURVED UNDER TENSION; SAID SHAFT SEMI-ENCIRCLING MEMBERS OF EACH IMPELLER BEING PROJECTED BETWEEN THE SHAFT SEMI-ENCIRCLING MEMBERS OF THE OTHER IMPELLER AND DEFINING AN AXIAL PATH FOR SAID SHAFT; SAID IMPELLERS BEING FRICTIONALLY RETAINED ON SAID SHAFT ONLY BY THE TORQUE OF THE TENSION OF SAID SHAFT SEMIENCIRCLING MEMBERS.
Claim 2
Dependent Claim
86 words
IN A BLOWER FAN CONSTRUCTION HAVING A DRIVABLE SHAFT DEFINING AN AXIS OF ROTATION, THE IMPROVEMENT COMPRISING: A PAIR OF ASSOCIATED IMPELLERS HAVING OPPOSED FAN FINS AND MEDIAL HUB PORTIONS; SAID HUB PORTIONS DEFINING SHAFT SEMI-ENCIRCLING MEMBERS CURVED UNDER TENSION; SAID SHAFT SEMI-ENCIRCLING MEMBERS OF EACH IMPELLER BEING PROJECTED BETWEEN THE SHAFT SEMI-ENCIRCLING MEMBERS OF THE OTHER IMPELLER AND DEFINING AN AXIAL PATH FOR SAID SHAFT; SAID IMPELLERS BEING FRICTIONALLY RETAINED ON SAID SHAFT ONLY BY THE TORQUE OF THE TENSION OF SAID SHAFT SEMIENCIRCLING MEMBERS.
References Cited (Backward Citations)
US1590699A
Cited
US3180269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |