Gerald D. Richels

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Blaine, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Various directional/omni-directional hearing aid microphone and hou...
- Patent number 6,690,806
- Issue date Feb 10, 2004
- Resistance Technology, Inc.
- Alexander L. Darbut
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Directional/omni-directional hearing aid microphone and housing
- Patent number 6,597,793
- Issue date Jul 22, 2003
- Resistance Technology, Inc.
- Alex Darbut
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Miniature microphone housing and switch
- Patent number D438860
- Issue date Mar 13, 2001
- Resistance Technology, Inc.
- Alexander L. Darbut
- D14 - Recording, communication, or information retrieval equipment
Information Patent Grant
Wire coil potentiometer wiper
- Patent number 5,818,324
- Issue date Oct 6, 1998
- Resistance Technology, Inc.
- Gerald D. Richels
- H01 - BASIC ELECTRIC ELEMENTS