Patent US4930984A successfully refreshed from Google Patents.
US4930984A
Expired / Lapsed
US
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Impeller
Assignee: Robert Bosch GmbH
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Filing: 1989-07-13
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Granted: 1990-06-05
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Expires: 2009-07-13
Abstract
Abstract An impeller comprises a central hub part, and a plurality of vanes extending from the central hb part, the plurality of vanes including two first neighboring vanes having a predetermined construction and at least one second vane located between the first vanes and having a construction which is different from the construction of the first vanes.
Inventors
- 👤 Bruno Kesel
- 👤 Gerhard Zink
- 👤 Karin Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:35
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/661; F04D29/666; F04D29/26; F04D29/32; F04D29/325; F04D29/326; F04D29/327
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
An impeller comprising a central hub part; a plurality of first vanes extending from said central hub part and all having a sickle-shaped cross-section of a predetermined size, said first vanes being spaced from each other and having an end remote from said central hub part; a plurality of second vanes extending from said central hub part and all having a shaped cross-section different from said sickle-shaped cross-section of said first vanes, said shaped cross-section of said second vanes being the same for all second vanes, and each of said second vanes being located in a space between two adjacent first vanes and having an end remote from said central hub part; and a ring surrounding the ends of said first and second vanes and being connected with said ends.
Claim 2
Dependent Claim
130 words
An impeller comprising a central hub part; a plurality of first vanes extending from said central hub part and all having a sickle-shaped cross-section of a predetermined size, said first vanes being spaced from each other and having an end remote from said central hub part; a plurality of second vanes extending from said central hub part and all having a shaped cross-section different from said sickle-shaped cross-section of said first vanes, said shaped cross-section of said second vanes being the same for all second vanes, and each of said second vanes being located in a space between two adjacent first vanes and having an end remote from said central hub part; and a ring surrounding the ends of said first and second vanes and being connected with said ends.
Claim 3
Dependent Claim
25 words
An impeller as defined in claim 1, wherein said ring has a radial size, and an axial size which is greater than said radial size.
Claim 4
Dependent Claim
26 words
An impeller as defined in claim 1, wherein said ring has an end side and is provided at said end side with a funnel-shaped expanded portion.
Claim 5
Dependent Claim
19 words
An impeller as defined in claim 3, wherein said funnel-shaped expanded portion has a cross-section with a uniform radius.
Claim 6
Dependent Claim
28 words
An impeller as defined in claim 1, wherein said first vanes have a sickle-shape with a curvature which is opposite to a direction of rotation of the impeller.
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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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |