US Patent 7134668 Differential pumping seal apparatus
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Patent Inventor Names
Hiroyuki Shinozaki0
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Patent abstract
A differential pumping seal apparatus includes a differential pumping seal for sealing a first space and a second space from each other in a non-contact manner, and a back up seal mechanism for sealing the first space and the second space from each other in a contact manner. The back up seal mechanism is operated to seal the first space and the second space from each other only when the differential pumping seal is stopped or while operation of said differential pumping seal is stopped.
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US Patent 07134668 Differential pumping seal apparatus US Patent 7134668 Differential pumping seal apparatus
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Patent Number
071346680
Patent Number
71346680
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Patent Jurisdiction
Patent Number
071346680
Date of Patent
November 14, 2006
0Patent Application Number
102780200
Date Filed
October 23, 2002
0Official Website
Patent Primary Examiner
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US Patent 07134668 Differential pumping seal apparatus
Infobox
Is a
Patent jurisdiction
Patent number
07134668
Date of patent
November 14, 2006
Patent application number
10278020
Date Filed
October 23, 2002
Patent primary examiner
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