US3249038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air intake
Assignee: AMERICAN WARMING AND VENTILATING Inc
•
Filing: 1963-09-16
•
Granted: 1966-05-03
•
Expires: 1983-09-16
Abstract
No abstract record available.
Inventors
- 👤 Edward H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:38
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
AN AIR INTAKE THROUGH WHICH AIR CAN FLOW FROM AN OUTSIDE SPACE UNDER HIGHER PRESSURE INTO AN INSIDE SPACE UNDER LOWER PRESSURE, SAID INTAKE COMPRISING A PLURALITY OF FRAME MEMBERS INCLUDING TWO SIDE FRAME MEMBERS, A PLURALITY OF PARALLEL, FIXED BLADES EXTENDING BETWEEN SAID SIDE FRAME MEMBERS, SAID FIXED BLADES EXTERNDING HORIZONTALLY AND BEING UNIFORMLY SPACED, EACH OF SAID BLADES ADAPTED TO SLOPE TOWARD THE HIGHER PRESSURE SPACE AT IN ANGLE OF FROM APPROXIMATELY 30* TO APPROXIMATELY 45*, EACH OF SAID FIXED BLADES HAVING A MAIN PORTION AND AN UPPER LIP EXTENDING UPWARDLY FROM AN UPPER, LONGITUDINAL EDGE OF THE MAIN PORTION OF THE BLADE, EACH OF SAID BLADES ALSO HAVING A LOWER LIP EXTENDING DOWNWARDLY FROM A LOWER LONGITUDINAL EDGE OF THE MAIN PORTION OF THE BLADE, AN AXLE EXTENDING BETWEEN SAID SIDE FRAME MEMBERS BE-
Claim 2
Dependent Claim
137 words
AN AIR INTAKE THROUGH WHICH AIR CAN FLOW FROM AN OUTSIDE SPACE UNDER HIGHER PRESSURE INTO AN INSIDE SPACE UNDER LOWER PRESSURE, SAID INTAKE COMPRISING A PLURALITY OF FRAME MEMBERS INCLUDING TWO SIDE FRAME MEMBERS, A PLURALITY OF PARALLEL, FIXED BLADES EXTENDING BETWEEN SAID SIDE FRAME MEMBERS, SAID FIXED BLADES EXTERNDING HORIZONTALLY AND BEING UNIFORMLY SPACED, EACH OF SAID BLADES ADAPTED TO SLOPE TOWARD THE HIGHER PRESSURE SPACE AT IN ANGLE OF FROM APPROXIMATELY 30* TO APPROXIMATELY 45*, EACH OF SAID FIXED BLADES HAVING A MAIN PORTION AND AN UPPER LIP EXTENDING UPWARDLY FROM AN UPPER, LONGITUDINAL EDGE OF THE MAIN PORTION OF THE BLADE, EACH OF SAID BLADES ALSO HAVING A LOWER LIP EXTENDING DOWNWARDLY FROM A LOWER LONGITUDINAL EDGE OF THE MAIN PORTION OF THE BLADE, AN AXLE EXTENDING BETWEEN SAID SIDE FRAME MEMBERS BE-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |