David E. E. Carmein

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Minneapolis, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Omni-directional treadmill
- Patent number 5,562,572
- Issue date Oct 8, 1996
- David E. E. Carmein
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Virtual reality system with enhanced sensory apparatus
- Patent number 5,490,784
- Issue date Feb 13, 1996
- David E. E. Carmein
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Portable water purification system including a filter cleaning mech...
- Patent number 5,106,500
- Issue date Apr 21, 1992
- Recovery Engineering, Inc.
- Richard D. Hembree
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Information Patent Grant
Differential-area piston type mixed-phase motors
- Patent number 4,945,725
- Issue date Aug 7, 1990
- Recovery Engineering, Inc.
- David E. Carmein
- F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
Information Patent Grant
Energy recovery apparatus
- Patent number 4,902,207
- Issue date Feb 20, 1990
- Recovery Engineering, Inc.
- Richard D. Hembree
- F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
Information Patent Grant
Energy recovery apparatus
- Patent number 4,793,153
- Issue date Dec 27, 1988
- Recovery Engineering, Inc.
- Richard D. Hembree
- F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...