US3280902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger employing two-stage cross-flow fan
Assignee: Individual
•
Filing: 1965-08-17
•
Granted: 1966-10-25
•
Expires: 1985-08-17
Abstract
No abstract record available.
Inventors
- 👤 Laing Nikolaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:22
CPC Classifications
F; F04; F04D; F04D17/00; F04D17/02; F04D17/04; Y; Y10; Y10S; Y10S165/00; Y10S165/228; Y10S165/302; Y10S165/311; Y10S165/313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A TWO-STORAGE CROSS-FLOW FAN COMPRISING FIRST AND SECOND CYLINDRICAL BLADED ROTORS OF EQUAL LENGTH MOUNTED FOR ROTATION ABOUT PARALLEL AXES, DRIVING MEANS TO ROTATE THE ROTORS IN PREDETERMINED DIRECTIONS, AND DUCTING PROVIDING END WALLS GENERALLY ALIGNED WITH THE ENDS OF THE ROTORS AND GUIDE WALLS INTERCONNECTING THE END WALLS, THE DUCTING DEFINING AN INLET FOR ENTRY OF AIR TO THE FIRST ROTOR, AN INTERMEDIATE SPACE BETWEEN THE ROTORS WHICH DIVERGES TOWARDS THE SECOND ROTOR AND AN OUTLET DUCT, THE INLET AND THE OUTLET DUCT FACING THE SAME GENERAL DIRECTION SO THAT IN PASSING THROUGH THE FAN THE AIR FOLLOWS A GENERALLY U-SHAPED PATH, THE GUIDE WALLS ALSO PROVIDING PORTIONS CO-OPERATING WITH SAID ROTORS ON ROTATION THEREOF TO INDUCE A FLOW OF AIR FROM THE INLET THROUGH THE PATH OF THE ROTATING BLADES OF THE FIRST ROTOR TO THE INTERIOR THEREOF AND THENCE AGAIN THROUGH THE PATH OF THE ROTATING BLADES OF THE FIRST ROTOR TO THE INTERMEDIATE SPACE, THE FLOW CON-
Claim 2
Dependent Claim
161 words
A TWO-STORAGE CROSS-FLOW FAN COMPRISING FIRST AND SECOND CYLINDRICAL BLADED ROTORS OF EQUAL LENGTH MOUNTED FOR ROTATION ABOUT PARALLEL AXES, DRIVING MEANS TO ROTATE THE ROTORS IN PREDETERMINED DIRECTIONS, AND DUCTING PROVIDING END WALLS GENERALLY ALIGNED WITH THE ENDS OF THE ROTORS AND GUIDE WALLS INTERCONNECTING THE END WALLS, THE DUCTING DEFINING AN INLET FOR ENTRY OF AIR TO THE FIRST ROTOR, AN INTERMEDIATE SPACE BETWEEN THE ROTORS WHICH DIVERGES TOWARDS THE SECOND ROTOR AND AN OUTLET DUCT, THE INLET AND THE OUTLET DUCT FACING THE SAME GENERAL DIRECTION SO THAT IN PASSING THROUGH THE FAN THE AIR FOLLOWS A GENERALLY U-SHAPED PATH, THE GUIDE WALLS ALSO PROVIDING PORTIONS CO-OPERATING WITH SAID ROTORS ON ROTATION THEREOF TO INDUCE A FLOW OF AIR FROM THE INLET THROUGH THE PATH OF THE ROTATING BLADES OF THE FIRST ROTOR TO THE INTERIOR THEREOF AND THENCE AGAIN THROUGH THE PATH OF THE ROTATING BLADES OF THE FIRST ROTOR TO THE INTERMEDIATE SPACE, THE FLOW CON-
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |