US3734640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airfoil vacuum pump with tapered rotor
Assignee: Individual
•
Filing: 1971-06-23
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Granted: 1973-05-22
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Expires: 1991-06-23
Abstract
Abstract An airfoil vacuum pump of the centrifugal type has a rotor disposed in a conical housing. The rotor has vanes that taper radially inwardly away from the rotor toward the axial inlet of the pump. The leading and trailing edges of the vanes converge in a direction toward the inlet, and the thickness of the vanes decreases in that direction.
Inventors
- 👤 W Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:32
CPC Classifications
F; F04; F04D; F04D17/00; F04D17/08; F04D17/16; F04D17/168; F04D29/00; F04D29/18; F04D29/22; F04D29/2238
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
An airfoil pump comprising a casing having an axially disposed inlet and a peripherally disposed outlet and tapering from a greatest axial width adjacent the inlet to a least axial width adjacent the outlet, and a rotor rotatably disposed in the casing, said rotor bearing at least one airfoil vane that extends away from the rotor and is inclined radially relative to the axis of rotation of the rotor, said at least one vane having leading and trailing edges that converge in a radially inward direction.
Claim 2
Dependent Claim
86 words
An airfoil pump comprising a casing having an axially disposed inlet and a peripherally disposed outlet and tapering from a greatest axial width adjacent the inlet to a least axial width adjacent the outlet, and a rotor rotatably disposed in the casing, said rotor bearing at least one airfoil vane that extends away from the rotor and is inclined radially relative to the axis of rotation of the rotor, said at least one vane having leading and trailing edges that converge in a radially inward direction.
Claim 3
Dependent Claim
11 words
A pump as claimed in claim 1, said casing being conical.
Claim 4
Dependent Claim
17 words
A pump as claimed in claim 1, said edges converging in a direction away from the rotor.
Claim 5
Dependent Claim
30 words
A pump as claimed in claim 1, said at least one vane having an airfoil cross-sectional configuration whose length and width progressively decrease in the direction away from the rotor.
Claim 6
Dependent Claim
52 words
A pump as claimed in claim 1, said rotor comprising a flat plate on which said at least one vane is mounted, said plate being spaced from but closely adjacent a flat plate comprising one side of said casing, said rotor having an axial drive shaft extending through the last-named flat plate.
Claim 7
Dependent Claim
39 words
A pump as claimed in claim 1, the radially outer surface of said at least one vane, from the region of greatest thickness of the vane to the trailing edge of the vane, being substantially concentric with said rotor.
Claim 8
Dependent Claim
59 words
A pump as claimed in claim 1, said vane having an airfoil cross-sectional configuration characterized by a leading edge and a trailing edge and a region of greatest thickness between said leading and trailing edges, the radially outer surface of said vane between said region of said greatest thickness and said trailing edge being substantially concentric with said rotor.
Claim 9
Dependent Claim
21 words
A pump as claimed in claim 1, said inlet and said rotor being disposed on opposite axial sides of said casing.
Claim 10
Dependent Claim
11 words
A pump as claimed in claim 8, said casing being conical.
Claim 11
Dependent Claim
28 words
A pump as claimed in claim 9, said casing having radially outer side walls that are inclined in substantially the same direction as said at least one vane.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |