US3276382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow device
Assignee: Individual
•
Filing: 1964-03-05
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Granted: 1966-10-04
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Expires: 1984-03-05
Abstract
No abstract record available.
Inventors
- 👤 Harvey E Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:11
CPC Classifications
F; F04; F04D; F04D3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A FLUID FLOW DEVICE COMPRISING A FLUID PASSAGE MEANS, A FIRST SET OF IMPELLER BLADES ROTATABLY MOUNTED IN SAID FLUID PASSAGE MEANS, A SECOND SET OF IMPELLER BLADES ROTATABLY MOUNTED IN SAID PASSAGE MEANS AND SPACED DOWNSTREAM FROM SAID FIRST SET OF BLADES IN PHASE RELATIVE TO THE SWIRLING FLUID FLOW EMANATING FROM SAID FIRST SET OF BLADES, SAID SECOND SET OF BLADES BEING PITCHED OPPOSITELY AND HAVING A GREATER PITCH RELATIVE TO SAID FIRST SET OF BLADES AND ELECTRICAL DRIVE MEANS OPERATIVELY CONNECTED TO SAID SETS OF IMPELLER BLADES FOR ROTATING THE SAME IN OPPOSITE DIRECTIONS SYNCHRONOUSLY.
Claim 2
Dependent Claim
98 words
A FLUID FLOW DEVICE COMPRISING A FLUID PASSAGE MEANS, A FIRST SET OF IMPELLER BLADES ROTATABLY MOUNTED IN SAID FLUID PASSAGE MEANS, A SECOND SET OF IMPELLER BLADES ROTATABLY MOUNTED IN SAID PASSAGE MEANS AND SPACED DOWNSTREAM FROM SAID FIRST SET OF BLADES IN PHASE RELATIVE TO THE SWIRLING FLUID FLOW EMANATING FROM SAID FIRST SET OF BLADES, SAID SECOND SET OF BLADES BEING PITCHED OPPOSITELY AND HAVING A GREATER PITCH RELATIVE TO SAID FIRST SET OF BLADES AND ELECTRICAL DRIVE MEANS OPERATIVELY CONNECTED TO SAID SETS OF IMPELLER BLADES FOR ROTATING THE SAME IN OPPOSITE DIRECTIONS SYNCHRONOUSLY.
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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |