Ralph M. Hoffmann

Person

Eden Prairie, MN, US

People

Patents Grantslast 30 patents

Information Patent Grant
Rotary epitrochoidal compressor
- Patent number 5,046,932
- Issue date Sep 10, 1991
- Compression Technologies, Inc.
- Ralph M. Hoffmann
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Apparatus and method for milling a trochoidal rotor
- Patent number 4,911,043
- Issue date Mar 27, 1990
- Compression Technologies, Inc.
- Ralph M. Hoffmann
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Constant level oiler
- Patent number 4,895,222
- Issue date Jan 23, 1990
- Foxport, Inc.
- Ralph M. Hoffmann
- G05 - CONTROLLING REGULATING
Information Patent Grant
Center-fill top cover for oilers
- Patent number 4,884,661
- Issue date Dec 5, 1989
- Ralph M. Hoffmann
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Swiveling mount for the outlet of a pressure vessel
- Patent number 4,827,983
- Issue date May 9, 1989
- Compression Technologies, Inc.
- Ralph M. Hoffmann
- F17 - STORING OF DISTRIBUTING GASES OR LIQUIDS
Information Patent Grant
Outer envelope trochoidal rotary device having a two piece rotor as...
- Patent number 4,778,362
- Issue date Oct 18, 1988
- Compression Technologies, Inc.
- Ralph Hoffmann
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Seal assembly for a rotary device
- Patent number 4,735,560
- Issue date Apr 5, 1988
- Larry Wydra
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Apparatus and method for replacing apex seals in a rotary device
- Patent number 4,728,270
- Issue date Mar 1, 1988
- Trochoid Power Corporation
- Ralph M. Hoffmann
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Outer envelope trochoidal rotary device having a rotor assembly hav...
- Patent number 4,721,445
- Issue date Jan 26, 1988
- Compression Technologies, Inc.
- Ralph Hoffmann
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Dual rotor gear assembly for trochoidal rotary device
- Patent number 4,551,083
- Issue date Nov 5, 1985
- Trochoid Power Corporation
- Ralph M. Hoffmann
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Driveshaft arrangement for a rotary expansible chamber device
- Patent number 4,400,145
- Issue date Aug 23, 1983
- Trochoid Power Corporation
- Ralph Hoffmann
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Driveshaft arrangement for trochoidal rotary device
- Patent number 4,382,755
- Issue date May 10, 1983
- Trochoid Power Corporation
- Ralph M. Hoffmann
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Rotary expansion power unit with valve disc connected to crankshaft
- Patent number 4,297,090
- Issue date Oct 27, 1981
- Trochoid Power Corporation
- Ralph M. Hoffmann
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES

Patents Applicationslast 30 patents

Information Patent Application
Vehicle leasing program
- Publication number 20040059595
- Publication date Mar 25, 2004
- Ralph Hoffmann
- G06 - COMPUTING CALCULATING COUNTING

Ralph M. Hoffmann

Person

Patents Grantslast 30 patents

Rotary epitrochoidal compressor

Apparatus and method for milling a trochoidal rotor

Constant level oiler

Center-fill top cover for oilers

Swiveling mount for the outlet of a pressure vessel

Outer envelope trochoidal rotary device having a two piece rotor as...

Seal assembly for a rotary device

Apparatus and method for replacing apex seals in a rotary device

Outer envelope trochoidal rotary device having a rotor assembly hav...

Dual rotor gear assembly for trochoidal rotary device

Driveshaft arrangement for a rotary expansible chamber device

Driveshaft arrangement for trochoidal rotary device

Rotary expansion power unit with valve disc connected to crankshaft

Patents Applicationslast 30 patents

Vehicle leasing program