Inventor
FISCHER DAVID A
US19 patents
⚠️ This page may combine multiple inventors who share the name “FISCHER DAVID A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
Q E D ENV SYSTEMS INC
7 patentsUS10029291B2Jul 24, 2018
Devices and methods for landfill gas well monitoring and control
Q E D ENV SYSTEMS INC15 citations83
US10144043B2Dec 4, 2018
Devices and methods for landfill gas well monitoring and control
Q E D ENV SYSTEMS INC5 citations72
US10053955B2Aug 21, 2018
System and method for distributed control of multiple wellheads
Q E D ENV SYSTEMS INC5 citations72
US11448238B2Sep 20, 2022
Pneumatic landfill pump cycle counter
Q E D ENV SYSTEMS INC2 citations68
US11560786B2Jan 24, 2023
Liquid level sensor system
Q E D ENV SYSTEMS INC1 citations56
US10272356B2Apr 30, 2019
Air stripper system and method
Q E D ENV SYSTEMS INC0 citations37
US10307805B2Jun 4, 2019
Landfill gas wellhead cap assembly
Q E D ENV SYSTEMS INC0 citations31
QED ENVIRONMENTAL SYSTEMS INC
5 patentsUS6508310B1Jan 21, 2003
Bladder-type sampling pump controller
QED ENVIRONMENTAL SYSTEMS INC35 citations91
US5301749AApr 12, 1994
Dual pump floating layer recovery apparatus
QED ENVIRONMENTAL SYSTEMS INC9 citations73
US6456201B1Sep 24, 2002
Method and apparatus for measuring groundwater levels
QED ENVIRONMENTAL SYSTEMS INC13 citations72
US6415659B1Jul 9, 2002
Method for analyzing purge water
QED ENVIRONMENTAL SYSTEMS INC10 citations72
US7347255B2Mar 25, 2008
Device for detecting water in product-only pump flow stream
QED ENVIRONMENTAL SYSTEMS INC4 citations54