Inventor · disambiguated record
Ralf Steffens
Also filed as: STEFFENS RALF
17 granted patents·4 pending applications·368 citations·filing 1988–2021
94Inventor score
Files withLEYBOLD AG6STEFFENS RALF6SIHI IND CONSULT GMBH2KLEIN STEFFEN1LEYBOLD HERAEUS GMBH & CO KG1
Top patents by PatentIndex Score
21 records- 0192US5767635ADisplacement machine with electronic motor synchronizationSIHI GMBH & CO KG·Filed 1994·Granted Jun 16, 1998·110 cites·21 claims
- 0286US6497563B1Dry-compressing screw pump having cooling medium through hollow rotor spindlesSTEFFENS RALF·Filed 2000·Granted Dec 24, 2002·30 cites·23 claims
- 0382US6666672B1Drive mechanism for a screw pumpFiled 2001·Granted Dec 23, 2003·21 cites·6 claims
- 0481US5152684ARotor profile for a roots vacuum pumpLEYBOLD AG·Filed 1991·Granted Oct 6, 1992·37 cites·5 claims
- 0579US5904473AVacuum pumpSIHI IND CONSULT GMBH·Filed 1996·Granted May 18, 1999·39 cites·9 claims
- 0675US8876506B2Displacement pump with internal compressionSTEFFENS RALF·Filed 2012·Granted Nov 4, 2014·2 cites·15 claims
- 0775US5924855AScrew compressor with coolingSIHI IND CONSULT GMBH·Filed 1996·Granted Jul 20, 1999·33 cites·12 claims
- 0869US4940398ATwin-shaft, multiple-stage vacuum pump with the shafts vertically disposedLEYBOLD AG·Filed 1988·Granted Jul 10, 1990·24 cites·19 claims
- 0963US7056108B2Cooled screw-type vacuum pumpLEYBOLD VAKUUM GMBH·Filed 2002·Granted Jun 6, 2006·9 cites·11 claims
- 1058US4983107AMultistage rotary piston vacuum pump having sleeves to fix shaft positionsLEYBOLD AG·Filed 1988·Granted Jan 8, 1991·15 cites·15 claims
- 1158US4974318AMethod of making a dual-shaft machineLEYBOLD AG·Filed 1989·Granted Dec 4, 1990·17 cites·18 claims
- 1256US12061023B2Water-based refrigerant for a thermal working machine and thermal working machine having such a refrigerantKLEIN STEFFEN·Filed 2021·Granted Aug 13, 2024·0 cites·16 claims
- 1354US10337515B2Spindle compressor using refrigerant cooling for housing and rotorSTEFFENS RALF·Filed 2015·Granted Jul 2, 2019·0 cites·12 claims
- 1450US5035590ADouble-shaft vacuum pump with synchronization gearsLEYBOLD AG·Filed 1990·Granted Jul 30, 1991·12 cites·22 claims
- 1549US4917583ABearing support for a twin-shaft pumpLEYBOLD AG·Filed 1988·Granted Apr 17, 1990·11 cites·24 claims
- 1647US12012961B2Volume ratio for a R718* compressorR 718 SPINDEL GBR·Filed 2021·Granted Jun 18, 2024·0 cites·11 claims
- 1746US2020309129A1Displacement compressor system for r-718STEFFENS RALF·Filed 2018·Application pending·0 cites
- 1844US2015118093A1Spindle compressorSTEFFENS RALF·Filed 2013·Application pending·0 cites
- 1944US2020386228A1Steam compressor comprising a dry positive-displacement unit as a spindle compressorSTEFFENS RALF·Filed 2018·Application pending·0 cites
- 2039US4915194ALubricating oil feed systemLEYBOLD HERAEUS GMBH & CO KG·Filed 1988·Granted Apr 10, 1990·8 cites·11 claims
- 2136US2004111884A1Profiled contour of a screw pumpFiled 2002·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →