David D. SIMPSON

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Discovery Bay, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Modular pneumatic well pump system
- Patent number 10,662,941
- Issue date May 26, 2020
- Q.E.D. Environmental Systems, Inc.
- David D. Simpson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Landfill well liquid level control pump
- Patent number 9,587,483
- Issue date Mar 7, 2017
- Q.E.D. Environmental Systems, Inc.
- Antonio U. Ramirez
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
MODULAR PNEUMATIC WELL PUMP SYSTEM
- Publication number 20180202436
- Publication date Jul 19, 2018
- Q.E.D. ENVIRONMENTAL SYSTEMS, INC.
- David D. SIMPSON
- E21 - EARTH DRILLING MINING
Information Patent Application
LANDFILL WELL LIQUID LEVEL CONTROL PUMP
- Publication number 20160356134
- Publication date Dec 8, 2016
- Q.E.D. ENVIRONMENTAL SYSTEMS, INC.
- Antonio U. RAMIREZ
- E21 - EARTH DRILLING MINING