Patent US5088899A successfully refreshed from Google Patents.
US5088899A
Expired / Lapsed
US
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Pump with drive motor
Assignee: Pfeiffer Vacuum Technology AG
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Filing: 1990-11-09
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Granted: 1992-02-18
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Expires: 2010-11-09
Abstract
Abstract A pump for conveying liquids and gases is formed by a drive motor having a stator (1) and a rotor (2). Helically shaped conveying grooves (3) are formed in the rotor (2) so that the rotor also serves as the shaft for the pump.
Inventors
- 👤 Armin Blecker
- 👤 Heinrich Lotz
- 👤 Helmut Ochs
- 👤 Horst Reuschling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:26
CPC Classifications
F; F04; F04D; F04D3/00; F04D3/02; F04D13/00; F04D13/02; F04D13/06; F04D13/0653; F04D25/00; F04D25/02; F04D25/06; F04D25/0606; H; H02; H02K; H02K7/00; H02K7/10; H02K7/12; H02K7/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A pump with a drive motor for conveying liquids and gases, said pump comprising an axially extending shaft (2) having an outer surface, at least one helically extending groove (3) for conveying liquid and gas formed in the outer surface of said shaft (2), said drive motor comprising an axially extending stator (1) and an axially extending rotor (2) located within said stator, and said shaft (2) forms said rotor with said groove (3) extending around the outer surface of said rotor (2) for the axial extent thereof.
Claim 2
Dependent Claim
88 words
A pump with a drive motor for conveying liquids and gases, said pump comprising an axially extending shaft (2) having an outer surface, at least one helically extending groove (3) for conveying liquid and gas formed in the outer surface of said shaft (2), said drive motor comprising an axially extending stator (1) and an axially extending rotor (2) located within said stator, and said shaft (2) forms said rotor with said groove (3) extending around the outer surface of said rotor (2) for the axial extent thereof.
Claim 3
Dependent Claim
56 words
A pump, as set forth in claim 1, wherein said stator (1) has a magnetic field H St with a lesser strength than a share of a saturated magnetic field H Sat expressed as follows: H.sub.St ≦H.sub.Sat (L-A/L) wherein A is the sum of the groove widths and L is the axial length of the rotor.
Claim 4
Dependent Claim
36 words
A pump, as set forth in claim 1, wherein said rotor has axially extending slots (4) therein for current-carrying conductors of said rotor (2) with said slots located radially inwardly of said helically shaped grooves (3).
Claim 5
Dependent Claim
36 words
A pump, as set forth in claim 2, wherein said rotor has axially extending slots (4) therein for current-carrying conductors of said rotor (2) with said slots located radially inwardly of said helically shaped grooves (3).
References Cited (Backward Citations)
US2592612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |