Patent US4069183A successfully refreshed from Google Patents.
Patent US4204802A successfully refreshed from Google Patents.
US4204802A
Expired / Lapsed
US
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Side channel compressor
Assignee: Siemens AG
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Filing: 1978-08-14
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Granted: 1980-05-27
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Expires: 1998-08-14
Abstract
Abstract In a side channel compressor, the blades arranged on the rotor are provided with a bevel on the back side of the blade at their lateral edges and the output characteristic can be changed by providing a slot-like recess at the blade edges in the entrance region of the blades. If required, such slot-like recess can be made as a retrofit.
Inventors
- 👤 Siegfried Schonwald
- 👤 Norbert Schmid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:28
CPC Classifications
F; F04; F04D; F04D23/00; F04D23/008
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
41 words
In a side channel compressor, having blades arranged on a rotor said blades having a bevel on the back side at their lateral edges, the improvement comprising a slot-like recess at each blade edge in the entrance region of the blades.
Claim 2
Dependent Claim
41 words
In a side channel compressor, having blades arranged on a rotor said blades having a bevel on the back side at their lateral edges, the improvement comprising a slot-like recess at each blade edge in the entrance region of the blades.
Claim 3
Dependent Claim
23 words
The improvement according to claim 1, wherein the axial depth of said slot-like recess corresponds approximately to the axial width of the bevel.
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) | 1983-05-27 | 1983-11-26 | 1984-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-27 | 1987-11-26 | 1988-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-27 | 1991-11-26 | 1992-05-27 | $7700.00 | Window Closed / Lapsed |