US3561883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blowers
Assignee: Individual
•
Filing: 1968-12-02
•
Granted: 1971-02-09
•
Expires: 1988-12-02
Abstract
Abstract THE ROTOR FOR A BLOWER COMPRISES A HUB OF VARYING CROSS-SECTION AND THE BLADES ARE MOUNTED ON THE HUB TO BE MOVABLE LENGTHWISE THEREOF TO SELECTED POSITIONS WHICH MAKE IT POSSIBLE TO MODIFY THE EXTERNAL DIAMETER OF THE HELIX AND CONSEQUENTLY THE OPERATING CHARACTERISTICS OF THE BLOWER.
Inventors
- 👤 Paul Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:24
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/36
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |