Inventor
DETTMERS MICHAEL
DE26 patents
⚠️ This page may combine multiple inventors who share the name “DETTMERS MICHAEL”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
GEWERK EISENHUETTE WESTFALIA
15 patentsUS4702148AOct 27, 1987
Control of the actuation of hydraulic consumers
GEWERK EISENHUETTE WESTFALIA14 citations74
US4327628AMay 4, 1982
Hydraulic roof support control system
GEWERK EISENHUETTE WESTFALIA10 citations74
US5159872ANov 3, 1992
Valve units for use in hydraulic control systems of mining equipment
GEWERK EISENHUETTE WESTFALIA15 citations73
US5060556AOct 29, 1991
Arrangement for emergency operation of hydraulic appliance in an electro-hydraulically controlled mineral mining installation
GEWERK EISENHUETTE WESTFALIA16 citations73
US4169689AOct 2, 1979
Tensioning a longwall mineral mining installation
GEWERK EISENHUETTE WESTFALIA10 citations70
US5157947AOct 27, 1992
Balanced hydraulic valve devices
GEWERK EISENHUETTE WESTFALIA9 citations68
US4613257ASep 23, 1986
Hydraulic control arrangement
GEWERK EISENHUETTE WESTFALIA5 citations63
US4572709AFeb 25, 1986
Control apparatus
GEWERK EISENHUETTE WESTFALIA6 citations63
US4537221AAug 27, 1985
Hydraulic control devices for use with mining apparatus
GEWERK EISENHUETTE WESTFALIA3 citations63
US4534681AAug 13, 1985
Mine roof supports
GEWERK EISENHUETTE WESTFALIA4 citations63
US4440522AApr 3, 1984
Hydraulic control arrangement for a roof support unit of a mineral mining installation
GEWERK EISENHUETTE WESTFALIA3 citations63
US4391181AJul 5, 1983
Hydraulic control systems for mining apparatus
GEWERK EISENHUETTE WESTFALIA5 citations63
US4247226AJan 27, 1981
Hydraulic conduit systems for mine installations
GEWERK EISENHUETTE WESTFALIA4 citations63
US4422807ADec 27, 1983
Mine roof supports
GEWERK EISENHUETTE WESTFALIA6 citations62
US4907779AMar 13, 1990
Electro-magnetically operated valve devices
GEWERK EISENHUETTE WESTFALIA1 citations52
DBT GMBH
10 patentsUS6073654AJun 13, 2000
Hydraulically trippable check valve for underground mine support hydraulics
DBT GMBH25 citations92
US7428861B2Sep 30, 2008
Valve for hydraulic props of shield-type support frames, and shield-type support frame
DBT GMBH7 citations73
US6609539B2Aug 26, 2003
Hydraulically operated directional control valve
DBT GMBH5 citations62
US6398181B1Jun 4, 2002
Valve arrangement
DBT GMBH6 citations62
US6616122B2Sep 9, 2003
Electromagnet switching device
DBT GMBH2 citations61
US7237983B2Jul 3, 2007
Hydraulic shield support
DBT GMBH3 citations60
US6779776B2Aug 24, 2004
Intrinsically safe electrically magnetically operated hydraulic valve
DBT GMBH6 citations60
US6481933B1Nov 19, 2002
Powered support frame for large seam thicknesses with controlled gap sealing plates
DBT GMBH5 citations57
US7740421B2Jun 22, 2010
Arrangement for the admission of pressurized water to spray systems
DBT GMBH0 citations40
US7489216B2Feb 10, 2009
Housing cover for switching solenoid housing
DBT GMBH0 citations35