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Patent US5106273A successfully refreshed from Google Patents.
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US5106273A Expired / Lapsed US ⏱️ 0.0 years remaining

Vacuum pump for producing a clean molecular vacuum

Assignee: Alcatel CIT SA
•
Filing: 1991-03-05
•
Granted: 1992-04-21
•
Expires: 2011-03-05
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Abstract

Abstract A vacuum pump for producing a clean molecular vacuum, the vacuum pump comprising a stator (1A, 1B) and a rotor (2), the rotor being driven by a drive motor (6, 7, 8) integrated in the pump, the rotor being supported by magnetic bearings, and being bell-shaped fitting over an internal projection (3) protruding from the stator, the stator components (7, 8) of the drive motor and of the bearings (11B, 12B, 13B, 15, 16) being situated on the periphery of the internal projection (3), the rotor components (11A, 12A, 13A, 14) of the drive motor and of the bearings being situated on the internal periphery of the bell-shaped rotor (2), the vacuum pump being characterized in that a first gastight coating (29) made of non-magnetic material covers the projection (3) overlying the stator components of the motor and of the bearings, and in that similarly in the rotor a second gastight coating (30) made of non-magnetic material covers the rotor components of the drive motor and of the bearings.

Inventors

  • 👤 Guy Lemarquand
  • 👤 Denis Perrillat-Amede
  • 👤 Didier Pierrejean

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 12:24
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/0408; F16C32/041; F16C32/0417; F04; F04D; F04D19/00; F04D19/02; F04D19/04; F04D19/048; F16C32/044; F16C32/0474; F16C32/0487; F16C2360/00; F16C2360/44; F16C2360/45

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 169 words
A vacuum pump for producing a clean molecular vacuum, said vacuum pump comprising a stator (1A, 1B) and a rotor (2), the rotor being driven by a drive motor (6, 7, 8) integrated in the pump, the rotor being supported by magnetic bearings, and being bell-shaped fitting over an internal projection (3) protruding from the stator, the stator components (7, 8) of the drive motor and of said bearings (11B, 12B, 13B, 15, 16) being situated on the periphery of said internal projection (3), the rotor components (11A, 12A, 13A, 14) of the drive motor and of said bearings being situated on the internal periphery of said bell-shaped rotor (2), said vacuum pump being characterized in that a first gastight coating (29) made of non-magnetic material covers said projection (3) overlying said stator components of the motor and of the bearings, and in that similarly in the rotor a second gastight coating (30) made of non-magnetic material covers said rotor components of the drive motor and of said bearings.
Claim 2
Dependent Claim 169 words
A vacuum pump for producing a clean molecular vacuum, said vacuum pump comprising a stator (1A, 1B) and a rotor (2), the rotor being driven by a drive motor (6, 7, 8) integrated in the pump, the rotor being supported by magnetic bearings, and being bell-shaped fitting over an internal projection (3) protruding from the stator, the stator components (7, 8) of the drive motor and of said bearings (11B, 12B, 13B, 15, 16) being situated on the periphery of said internal projection (3), the rotor components (11A, 12A, 13A, 14) of the drive motor and of said bearings being situated on the internal periphery of said bell-shaped rotor (2), said vacuum pump being characterized in that a first gastight coating (29) made of non-magnetic material covers said projection (3) overlying said stator components of the motor and of the bearings, and in that similarly in the rotor a second gastight coating (30) made of non-magnetic material covers said rotor components of the drive motor and of said bearings.
Claim 3
Dependent Claim 21 words
A vacuum pump according to claim 1, characterized in that said coatings are made of aluminum and cemented in a vacuum.
Claim 4
Dependent Claim 25 words
A vacuum pump according to claim 1, characterized in that said coatings are constituted by a deposit of nickel applied by evaporation in a vacuum.
Claim 5
Dependent Claim 22 words
A vacuum pump according to claim 1, characterized in that said coatings are made of ceramic and are cemented in a vacuum.

References Cited (Backward Citations)

DE1750602A1 Cited
FR2246756A1 Cited
US4337981A Cited
US4812694A Cited
US4036565A Cited
EP0071456A1 Cited
US4717315A Cited
US4500142A Cited
US4563046A Cited
US4787829A Cited
US4878813A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-04-21 1995-10-21 1996-04-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-04-21 1999-10-21 2000-04-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-04-21 2003-10-21 2004-04-21 $7700.00 Window Closed / Lapsed

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