Inventor

Erich Steingroever

Inventor

Bonn, DE

Overview

38→

Patents

1976–2003

Patent span

Electricity

Primary field (CPC H)

Patents· 38 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H01Fprimary

H01FMagnets37%

G01RMeasuring electric variables12%

Y10TTechnical subjects covered by former us classification12%

B21DWorking or processing of sheet metal or metal tubes, rods or profiles without essentially removing material10%

G01BMeasuring length, thickness or similar linear dimensions7%

B30BPresses in general3%

B67BApplying closure members to bottles jars, or similar containers3%

H03KPulse technique3%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%

B22FWorking metallic powder2%

PatentTitleYear

6,538,434'Magnetically responsive device for measuring the thickness of magnetic films'2003 6,065,317'Apparatus and procedure for manufacturing metallic hollow bodies with structural bulges'2000 5,964,127'Process and apparatus for manufacturing metallic hollow bodies with structural bulges'1999 5,953,805'Magnet field concentrator for shaping metal parts'1999 5,864,274'Magneto-mechanical power system'1999 5,813,264'Method for forming a workpiece by a magnetic field generated by a current impulse'1998 5,684,341'Electromagnetic generator for fast current and magnetic field pulses, for example, for use in magnetic metal working'1997 5,586,460'Device with peak current loop and process for the magnetic shaping of metal parts'1996 5,452,506'Process for removing container seals'1995 5,444,963'Process and equipment for shaping container seals'1995 5,374,915'Magnetizing device for permanent magnet rings that are bipolar on the end faces or multipolar on the lateral faces'1994 5,079,534'Electromagnet with press die and adjustable air gap'1992 4,818,305'Process for the production of elongated articles, especially magnets, from hard powdered materials'1989 4,794,358'Magnetic field coil with disc-shaped conductor'1988 4,782,293'Process for adjusting the magnetic field strength of permanent magnets'1988 4,638,280'Multipolar magnetizing device provided with cooling means'1987 4,625,166'Method for measuring magnetic potentials using hall probes'1986 4,529,954'Magnetizing apparatus for anisotropic permanent magnets'1985 4,470,031'Multipolar magnetizing device for permanent magnets'1984 4,463,313'Field coil for use with potential coil for measuring inner field intensity of magnetic material'1984 4,449,095'Process and apparatus for recording hysteresis curves of magnetic materials'1984 4,384,313'Process for demagnetizing components by alternating magnetic fields of varying intensity'1983 4,381,492'Apparatus for magnetizing multipolar permanent magnets'1983 4,354,218'Process and apparatus for multi-polar magnetization of annular permanent magnets'1982 4,331,101'Electrographic copying device with magnetic cylinder'1982 4,258,405'Electrical impulse generator'1981 4,238,734'Apparatus for measuring the magnetic moments of a body using a magnetic field generated by a permanent magnetic'1980 4,160,208'Method of calibrating magnetic thickness gauges'1979 4,150,927'Mold for the production of anisotropic permanent magnets'1979 4,137,498'Magnetic flux standard and method for calibrating fluxmeters'1979 4,125,807'Magnetic thickness gauge having convertible scales'1978 4,063,970'Method of making permanent magnets'1977 4,058,763'Apparatus for automatically magnetizing permanent magnet bodies, measuring their magnetic retentivity and sorting them'1977 4,021,763'Apparatus and process for multipolar magnetization of magnetic information storage sheets'1977 3,985,843'Process for molding ring magnets for radially oriented particles'1976 3,985,596'Process for producing crystal-oriented permanent magnets'1976 3,986,105'Dual purpose electromagnetic thickness gauge'1976 3,976,935'Apparatus for measuring the internal field intensity of magnet bodies'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1989Patents assigned to MAGNETFAB BONN GMBH (6)· patent assignee history

1976–1979Patents assigned to NIX STEINGROEVE ELEKTRO PHYSIK (5)· patent assignee history

1976–2003Based in Bonn, DE· patent location history

1978Based in Cologne, DE· patent location history

1982–1992Patents assigned to STEINGROEVER DIETRICH (12)· patent assignee history

1983–1992Patents assigned to STEINGROEVER ERICH (11)· patent assignee history

1994–2000Patents assigned to STEINGROEVER MAGNET PHYSIK (10)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
STEINGROEVER DIETRICH	12	1982–1992
STEINGROEVER ERICHself	11	1983–1992
STEINGROEVER MAGNET PHYSIK	10	1994–2000
MAGNETFAB BONN GMBH	6	1976–1989
NIX STEINGROEVE ELEKTRO PHYSIK	5	1976–1979

Locations

Location	Patents	Span
Bonn, DE	37	1976–2003
Cologne, DE	1	1978