US3101662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof ventilator
Assignee: Individual
•
Filing: 1959-09-03
•
Granted: 1963-08-27
•
Expires: 1979-09-03
Abstract
No abstract record available.
Inventors
- 👤 Lawrence L Alldritt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:59
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; F24F7/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
IN A POWER DRIVEN ROOF VENTILATOR INCLUDING A ROUND CASING OPEN AT ITS TOP AND BOTTOM AND ADAPTED TO BE MOUNTED WITH ITS AXIS VERTICAL ON A ROOF OVER AN OPENING THEREIN AND TERMINATING UPWARDLY INA UPPER EDGE, A ROUNDED, DOWNWARDLY CONCAVELY CURVED HOOD FIXEDLY MOUNTED COAXIALLY ABOVE THE CASING AND EXTENDING LATERALLY OUTWARD BEYOND SAID UPPER EDGE OF THE CASING ON ALL SIDES OF THE CASING, A FAN WHEEL MOUNTED FOR ROTATION BENEATH THE HOOD COAXIALLY OF THE CASING AND INCLUDING A PLURALITY OF OUTWARDLY EXTENDING PROPELLER FAN BLADES, AND POWER MEANS FOR ROTATING THE FAN WHEEL ABOUT SAID AXIS; THE IMPROVEMENT COMPRISING THE FAN BLADES HAVING AN UPPER PORTION HAVING AN UPWARDLY CONCAVE UPPER SURFACE MADE UP OF AN INFINITE NUMBER OF PARALLEL STRAIGHT LINES ONE OF WHICH PASSES THROUGH THE AXIS OF ROTATION OF THE FAN WHEEL AND IS INCLINED DOWNWARDLY OUTWARDLY AT AN ACUTE ANGLE TO THE HORIZONTAL AND IS DISPOSED ABOVE SAID UPPER EDGE, AT LEAST A PORTION OF THE BLADE EXTENDING BELOW SAID UPPER EDGE.
Claim 2
Dependent Claim
171 words
IN A POWER DRIVEN ROOF VENTILATOR INCLUDING A ROUND CASING OPEN AT ITS TOP AND BOTTOM AND ADAPTED TO BE MOUNTED WITH ITS AXIS VERTICAL ON A ROOF OVER AN OPENING THEREIN AND TERMINATING UPWARDLY INA UPPER EDGE, A ROUNDED, DOWNWARDLY CONCAVELY CURVED HOOD FIXEDLY MOUNTED COAXIALLY ABOVE THE CASING AND EXTENDING LATERALLY OUTWARD BEYOND SAID UPPER EDGE OF THE CASING ON ALL SIDES OF THE CASING, A FAN WHEEL MOUNTED FOR ROTATION BENEATH THE HOOD COAXIALLY OF THE CASING AND INCLUDING A PLURALITY OF OUTWARDLY EXTENDING PROPELLER FAN BLADES, AND POWER MEANS FOR ROTATING THE FAN WHEEL ABOUT SAID AXIS; THE IMPROVEMENT COMPRISING THE FAN BLADES HAVING AN UPPER PORTION HAVING AN UPWARDLY CONCAVE UPPER SURFACE MADE UP OF AN INFINITE NUMBER OF PARALLEL STRAIGHT LINES ONE OF WHICH PASSES THROUGH THE AXIS OF ROTATION OF THE FAN WHEEL AND IS INCLINED DOWNWARDLY OUTWARDLY AT AN ACUTE ANGLE TO THE HORIZONTAL AND IS DISPOSED ABOVE SAID UPPER EDGE, AT LEAST A PORTION OF THE BLADE EXTENDING BELOW SAID UPPER EDGE.
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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) | 1966-08-26 | 1967-02-25 | 1967-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-26 | 1971-02-25 | 1971-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-26 | 1975-02-25 | 1975-08-27 | $7700.00 | Window Closed / Lapsed |