Donald B. Heckman

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Purcellville, VA, US

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Patents Grantslast 30 patents

Information Patent Grant
Open channel flowmeter utilizing surface velocity and lookdown leve...
- Patent number 5,811,688
- Issue date Sep 22, 1998
- Marsh-McBirney, Inc.
- Lawrence B. Marsh
- E03 - WATER SUPPLY SEWERAGE
Information Patent Grant
Port forward sensor for liquid level gauge or flowmeter
- Patent number 5,644,088
- Issue date Jul 1, 1997
- Marsh-McBirney, Inc.
- Donald B. Heckman
- G01 - MEASURING TESTING
Information Patent Grant
Flowmeter having active temperature compensation
- Patent number 5,544,531
- Issue date Aug 13, 1996
- Marsh-McBirney, Inc.
- Donald B. Heckman
- G01 - MEASURING TESTING
Information Patent Grant
Liquid flowmeter including doppler signal processing, and method
- Patent number 5,421,211
- Issue date Jun 6, 1995
- Marsh-McBirney, Inc.
- Donald B. Heckman
- G01 - MEASURING TESTING