US3307776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-working machines
Assignee: James Howden and Co Ltd
•
Filing: 1965-04-15
•
Granted: 1967-03-07
•
Expires: 1985-04-15
Abstract
No abstract record available.
Inventors
- 👤 William W White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:57
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/161; F04D29/162; F04D27/00; F04D27/009; F04D27/02; F04D27/0207; F04D27/0215; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN A CENTRIFUGAL FAN COMPRISING A CASING HAVING A PAIR OF SPACED SIDE WALLS, AN IMPELLER ROTATABLE IN THE CASING BETWEEN THE SIDE WALLS AND HAVING ITS INLET SIDE SPACED FROM A SIDE WALL TO DEFINE THEREWITH AN ANNULAR SPACE INTO WHICH HIGH PRESSURE FLUID LEAKS FROM THE IMPELLER OUTLET, AN INLET OPENING IN SAID SIDE WALL, AND AN INLET CONDUIT EXTENDING WITHIN THE CASING FROM THE INLET OPENING AND AT ITS INNER END FORMING WITH THE IMPELLER INLET AN ANNULAR LEAKAGE ORIFICE, THE ANNULAR SPACE OPENING INTO THE ANNULAR ORIFICE SO THAT HIGH PRESSURE LEAKAGE FLUID FLOWS FROM THE ANNULAR SPACE AXIALLY THROUGH THE ANNULAR ORIFICE INTO THE IMPELLER; A PERIPHERAL SERIES OF AXIALLY EXTENDING GUIDE VANES ON THE EXTERIOR OF THE INLET CONDUIT TO GUIDE AND STABILIZE THE LEAKAGE FLOW OF FLUID THROUGH THE ANNULAR SPACE TOWARDS THE ANNULAR ORIFICE.
Claim 2
Dependent Claim
142 words
IN A CENTRIFUGAL FAN COMPRISING A CASING HAVING A PAIR OF SPACED SIDE WALLS, AN IMPELLER ROTATABLE IN THE CASING BETWEEN THE SIDE WALLS AND HAVING ITS INLET SIDE SPACED FROM A SIDE WALL TO DEFINE THEREWITH AN ANNULAR SPACE INTO WHICH HIGH PRESSURE FLUID LEAKS FROM THE IMPELLER OUTLET, AN INLET OPENING IN SAID SIDE WALL, AND AN INLET CONDUIT EXTENDING WITHIN THE CASING FROM THE INLET OPENING AND AT ITS INNER END FORMING WITH THE IMPELLER INLET AN ANNULAR LEAKAGE ORIFICE, THE ANNULAR SPACE OPENING INTO THE ANNULAR ORIFICE SO THAT HIGH PRESSURE LEAKAGE FLUID FLOWS FROM THE ANNULAR SPACE AXIALLY THROUGH THE ANNULAR ORIFICE INTO THE IMPELLER; A PERIPHERAL SERIES OF AXIALLY EXTENDING GUIDE VANES ON THE EXTERIOR OF THE INLET CONDUIT TO GUIDE AND STABILIZE THE LEAKAGE FLOW OF FLUID THROUGH THE ANNULAR SPACE TOWARDS THE ANNULAR ORIFICE.
References Cited (Backward Citations)
CA589244A
Cited
US971850A
Cited
US820779A
Cited
US1646897A
Cited
US1787656A
Cited
US2143100A
Cited
US2656096A
Cited
GB710391A
Cited
FR1200157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |