US3237849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frame for electrically driven fan
Assignee: IMC Magnetics Corp
•
Filing: 1964-03-09
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Granted: 1966-03-01
•
Expires: 1984-03-09
Abstract
No abstract record available.
Inventors
- 👤 Krell Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:55
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/64; F04D29/644; F04D29/646; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/542; F04D29/544
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
AN ELECTRICALLY DRIVEN FAN COMPRISING A FRAME HAVING A CENTRAL OPENING, AN ELECTRIC MOTOR HAVING A CIRCULAR OUTER CONTOUR ARRANGED AT THE CENTER OF SAID OPENING, A PLURALITY OF FAN BLADES ADAPTED TO BE ROTATED ABOUT THE AXIS OF SAID MOTOR, EACH OF SAID BLADES HAVING STRAIGHT SIDE EDGES, AND A PLURALTY OF STRUTS FOR SUPPORTING SAID MOTOR EXTENDING BETWEEN SAID MOTOR AND SAID FRAME, THE END OF EACH STRUT ADJACENT TO SAID FRAME BEING SPACED FORWARDLY IN THE DIRECTION OF ROTATION OF SAID BLADES FROM THE END ADJACENT TO SAID MOTOR, WHEREBY AS SAID BLADES ROTATE, THE PORTION OF EACH BLADE CLOSEST TO SAID MOTOR WILL FIRST CROSS ANY PARTICULAR STRUT, THEREAFTER THE CENTRAL PORTION OF SAID BLADE WILL CROSS THE STRUT, AND STILL LATER THE PORTION OF THE BLADE CLOSEST TO SAID FRAME WILL CROSS SAID STRUT SO THAT AT ANY ONE TIME ONLY A PORTION OF THE AIR BEING MOVED BY A LONGITUDINAL SECTION OF THE BLADE IS OBSTRUCTED BY THE STRUT.
Claim 2
Dependent Claim
165 words
AN ELECTRICALLY DRIVEN FAN COMPRISING A FRAME HAVING A CENTRAL OPENING, AN ELECTRIC MOTOR HAVING A CIRCULAR OUTER CONTOUR ARRANGED AT THE CENTER OF SAID OPENING, A PLURALITY OF FAN BLADES ADAPTED TO BE ROTATED ABOUT THE AXIS OF SAID MOTOR, EACH OF SAID BLADES HAVING STRAIGHT SIDE EDGES, AND A PLURALTY OF STRUTS FOR SUPPORTING SAID MOTOR EXTENDING BETWEEN SAID MOTOR AND SAID FRAME, THE END OF EACH STRUT ADJACENT TO SAID FRAME BEING SPACED FORWARDLY IN THE DIRECTION OF ROTATION OF SAID BLADES FROM THE END ADJACENT TO SAID MOTOR, WHEREBY AS SAID BLADES ROTATE, THE PORTION OF EACH BLADE CLOSEST TO SAID MOTOR WILL FIRST CROSS ANY PARTICULAR STRUT, THEREAFTER THE CENTRAL PORTION OF SAID BLADE WILL CROSS THE STRUT, AND STILL LATER THE PORTION OF THE BLADE CLOSEST TO SAID FRAME WILL CROSS SAID STRUT SO THAT AT ANY ONE TIME ONLY A PORTION OF THE AIR BEING MOVED BY A LONGITUDINAL SECTION OF THE BLADE IS OBSTRUCTED BY THE STRUT.
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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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |