Patent US3899266A successfully refreshed from Google Patents.
US3899266A
Expired / Lapsed
US
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Vortex blower
Assignee: Hitachi Ltd
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Filing: 1973-12-07
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Granted: 1975-08-12
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Expires: 1993-12-07
Abstract
Abstract A vortex blower having rotor blades whose edges are contoured to accommodate air flow within the vortex blower, whereby the development of wake caused by the edges of rotor blades in the rear thereof is minimized.
Inventors
- 👤 Tadahisa Masai
- 👤 Tetsuro Adachi
- 👤 Shigeru Sasaki
- 👤 Kazuyoshi Moriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:34
CPC Classifications
F; F04; F04D; F04D23/00; F04D23/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A vortex blower consisting of a stator body including an air passage having a suction port and a discharge port open thereto in the vicinity of the opposite ends of said passage and a rotor body having an air chamber divided into compartments by a plurality of rotor blades, in which the edge faces of the rotor blades in the vicinity of the inner circumference thereof is inclined rearwardly with respect to the rotational direction of said rotor body, the edge face of a rotor blade covering from the inner circumference to the outer circumference of said blade being so inclined that the height of the blade at the trailing edge of said edge face with respect to the rotational direction of the rotor is greater than that of the blade at the leading edge of said edge face.
Claim 2
Dependent Claim
139 words
A vortex blower consisting of a stator body including an air passage having a suction port and a discharge port open thereto in the vicinity of the opposite ends of said passage and a rotor body having an air chamber divided into compartments by a plurality of rotor blades, in which the edge faces of the rotor blades in the vicinity of the inner circumference thereof is inclined rearwardly with respect to the rotational direction of said rotor body, the edge face of a rotor blade covering from the inner circumference to the outer circumference of said blade being so inclined that the height of the blade at the trailing edge of said edge face with respect to the rotational direction of the rotor is greater than that of the blade at the leading edge of said edge face.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |