William B. Helfman

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Chula Vista, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Gas diffusion sampling and measurement system for occupational dosi...
- Patent number 6,607,700
- Issue date Aug 19, 2003
- Quantum Group, Inc.
- Michael G. Apte
- G01 - MEASURING TESTING
Information Patent Grant
Non-regenerating carbon monoxide sensor
- Patent number 5,733,505
- Issue date Mar 31, 1998
- Mark K. Goldstein
- G01 - MEASURING TESTING