Patent US6185684B1 successfully refreshed from Google Patents.
US3285501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal fans
Assignee: Individual
•
Filing: 1964-12-07
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Granted: 1966-11-15
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Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 John E Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:46
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/161; F04D29/162; F04D29/40; F04D29/42; F04D29/4206; F04D29/4213; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A CENTRIFUGAL FAN COMPRISING A CASING; A FAN WHEEL SUPPORTED FOR ROTATION WITHIN SAID CASING, SAID WHEEL HAVING A CIRCULAR AXIAL INLET, AND HAVING A SIDE PLATE AROUND SAID INLET; SAID CASING HAVING AN INLET CONCENTRIC WITH SAID INLET, AND HAVING A RELATIVELY LONG ANNULAR WALL EXTENDING FROM SAID INLET OF SAID CASING TOWARDS SAID INLET OF SAID WHEEL, SAID WALL HAVING AN AXIALLY INNER END IN A CIRCLE CONCENTRIC WITH SAID INLETS AND IN A PLANE NORMAL TO THE AXIS OF SAID WHEEL, SAID END BEING SPACED AXIALLY OUTWARDLY FROM SAID INLET OF SAID WHEEL; GENERALLY PARTI-TOROIDAL, FIXED WALL MEANS EXTENDING PARTIALLY AROUND A CIRCULAR AXIS, AND HAVING A RADIALLY INNER PORTION FORMED BY A RELATIVELY SHORT PORTION OF SAID WALL EXTENDING FROM SAID END TOWARDS SAID INLET OF SAID CASING, SAID CIRCULAR AXIS HAVING A SMALLER DIAMETER THAN THAT OF SAID WHEEL, SAID WALL MEANS HAVING A RADIALLY OUTER PORTION WITH AN AXIALLY INNER END CLOSELY ADJACENT TO SAID SIDE PLATE, SAID WALL MEANS HAVING A CURVED, IN SECTION, INTERMEDIATE PORTION
Claim 2
Dependent Claim
173 words
A CENTRIFUGAL FAN COMPRISING A CASING; A FAN WHEEL SUPPORTED FOR ROTATION WITHIN SAID CASING, SAID WHEEL HAVING A CIRCULAR AXIAL INLET, AND HAVING A SIDE PLATE AROUND SAID INLET; SAID CASING HAVING AN INLET CONCENTRIC WITH SAID INLET, AND HAVING A RELATIVELY LONG ANNULAR WALL EXTENDING FROM SAID INLET OF SAID CASING TOWARDS SAID INLET OF SAID WHEEL, SAID WALL HAVING AN AXIALLY INNER END IN A CIRCLE CONCENTRIC WITH SAID INLETS AND IN A PLANE NORMAL TO THE AXIS OF SAID WHEEL, SAID END BEING SPACED AXIALLY OUTWARDLY FROM SAID INLET OF SAID WHEEL; GENERALLY PARTI-TOROIDAL, FIXED WALL MEANS EXTENDING PARTIALLY AROUND A CIRCULAR AXIS, AND HAVING A RADIALLY INNER PORTION FORMED BY A RELATIVELY SHORT PORTION OF SAID WALL EXTENDING FROM SAID END TOWARDS SAID INLET OF SAID CASING, SAID CIRCULAR AXIS HAVING A SMALLER DIAMETER THAN THAT OF SAID WHEEL, SAID WALL MEANS HAVING A RADIALLY OUTER PORTION WITH AN AXIALLY INNER END CLOSELY ADJACENT TO SAID SIDE PLATE, SAID WALL MEANS HAVING A CURVED, IN SECTION, INTERMEDIATE PORTION
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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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |