P

Inventor

PREISSER FRIEDRICH

DE9 patents
⚠️ This page may combine multiple inventors who share the name “PREISSER FRIEDRICH”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

DEGUSSA

5 patents
US4867808ASep 19, 1989

Heat treating a metallic workpiece by quenching under cooling gas under above atmospheric pressure and specified circulation rate

DEGUSSA22 citations80
US5292555AMar 8, 1994

Process for applying nitride layers to titanium

DEGUSSA6 citations72
US5211768AMay 18, 1993

Method of nitriding work pieces of steel under pressure

DEGUSSA12 citations70
US4869470ASep 26, 1989

Vacuum furnace for heat treatment of metallic workpieces

DEGUSSA8 citations68
US4906330AMar 6, 1990

Process for the disposal of hardening-shop wastewaters

DEGUSSA0 citations50

LEYBOLD DURFERRIT GMBH

2 patents
US5372655ADec 13, 1994

Method for the treatment of alloy steels and refractory metals

LEYBOLD DURFERRIT GMBH22 citations89
US5225142AJul 6, 1993

Method and apparatus for the automatic monitoring of operating safety and for controlling the progress of the process in a vacuum heat-treatment oven

LEYBOLD DURFERRIT GMBH7 citations71

ALD VACUUM TECHN GMBH

1 patent
US5630322AMay 20, 1997

Process and apparatus for heat treatment of workpieces by quenching with gases

ALD VACUUM TECHN GMBH102 citations95

LEYBOLD DURFRRIT GMBH

1 patent
US5362031ANov 8, 1994

Method and apparatus for the automatic monitoring of operating safety and for controlling the progress of the process in a vacuum heat-treatment oven

LEYBOLD DURFRRIT GMBH20 citations86