4. Machines not elsewhere specified
  5. Pump or compressor

Thomas Dreifert

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Cooled screw vacuum pump

Rotary expansible chamber devices – Heat exchange or non-working fluid lubricating or sealing – With pump for non-working fluid
Reexamination Certificate

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Dry compressing vacuum pump having a gas ballast device

Pumps – Successive stages – With interstage intake or additional inlet to latter stage
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Eccentric pump and method for operation of said pump

Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate

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Screw vacuum pump provided with rotors

Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Reexamination Certificate

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Two shaft vacuum pump with cantilevered rotors

Pumps – Motor driven – Electric or magnetic motor
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Profile ID: LFUS-PAI-P-2334526

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