STEFFENS; RALF
Patent Applications and Registrations
Patent applications and USPTO patent grants for STEFFENS; RALF.The latest application filed is for "water-based refrigerant for a thermal working machine and thermal working machine having such a refrigerant".
- STEFFENS; RALF - ESSLINGEN DE
- Steffens; Ralf - Lorach N/A DE
- Steffens; Ralf - Steinen DE
- Steffens; Ralf - D-50389 Wesseling-Urfeld DE
- Steffens; Ralf - Lohbarbek DE
- Steffens; Ralf - Koln DE
- Steffens; Ralf - Cologne DE
| Patent | Date |
|---|---|
| Water-based Refrigerant For A Thermal Working Machine And Thermal Working Machine Having Such A Refrigerant App 20210404715 - KLEIN; STEFFEN ; et al. | 2021-12-30 |
| Steam Compressor Comprising A Dry Positive-displacement Unit As A Spindle Compressor App 20200386228 - STEFFENS; Ralf | 2020-12-10 |
| Displacement Compressor System For R-718 App 20200309129 - STEFFENS; Ralf | 2020-10-01 |
| Spindle compressor using refrigerant cooling for housing and rotor Grant 10,337,515 - Steffens | 2019-07-02 |
| Compression Refrigeration Machine Having A Spindle Compressor App 20170089342 - Steffens; Ralf | 2017-03-30 |
| Spindle Compressor App 20150118093 - Steffens; Ralf | 2015-04-30 |
| Displacement pump with internal compression Grant 8,876,506 - Steffens November 4, 2 | 2014-11-04 |
| Displacement Pump with Internal Compression App 20120171068 - Steffens; Ralf | 2012-07-05 |
| Cooled screw-type vacuum pump Grant 7,056,108 - Behling , et al. June 6, 2 | 2006-06-06 |
| Cooled screw-type vacuum pump App 20040265160 - Behling, Manfred ; et al. | 2004-12-30 |
| Profiled contour of a screw pump App 20040111884 - Steffens, Ralf | 2004-06-17 |
| Drive mechanism for a screw pump Grant 6,666,672 - Steffens December 23, 2 | 2003-12-23 |
| Dry-compressing screw pump having cooling medium through hollow rotor spindles Grant 6,497,563 - Steffens December 24, 2 | 2002-12-24 |
| Screw compressor with cooling Grant 5,924,855 - Dahmlos , et al. July 20, 1 | 1999-07-20 |
| Displacement machine with electronic motor synchronization Grant 5,767,635 - Steffens , et al. June 16, 1 | 1998-06-16 |
| Rotor profile for a Roots vacuum pump Grant 5,152,684 - Steffens October 6, 1 | 1992-10-06 |
| Lubricating oil feed system Grant 4,915,194 - Englander , et al. April 10, 1 | 1990-04-10 |
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