P

Inventor

HELGELAND WALTER

US10 patents
⚠️ This page may combine multiple inventors who share the name “HELGELAND WALTER”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

RIGAKU USA INC

3 patents
US5826885AOct 27, 1998

Magnetic fluid sealing device

RIGAKU USA INC92 citations94
US5975536ANov 2, 1999

Rotary motion feedthrough with rotating magnet system

RIGAKU USA INC30 citations90
US6199867B1Mar 13, 2001

Rotary motion feedthrough device

RIGAKU USA INC31 citations89

FERROFLUIDICS CORP

2 patents
US4663128AMay 5, 1987

Pulling head for a crystal growing furnace

FERROFLUIDICS CORP29 citations91
US4350560ASep 21, 1982

Apparatus for and method of handling crystals from crystal-growing furnaces

FERROFLUIDICS CORP92 citations90

MAHONEY DAVID G

1 patent
US8430409B2Apr 30, 2013

Magnetic fluid seal with precise control of fluid volume at each seal stage

MAHONEY DAVID G3 citations54

RIGAKU INNOVATIVE TECHNOLOGIES

1 patent
US8382118B2Feb 26, 2013

Magnetic fluid seal with centering of bearing and shaft by compressible member

RIGAKU INNOVATIVE TECHNOLOGIES1 citations49

RIGAKU INNOVATIVE TECH INC

1 patent
US9816617B2Nov 14, 2017

Magnetic fluid seal with precise control of fluid volume at each seal stage

RIGAKU INNOVATIVE TECH INC0 citations44

RIGAKU TECHNOLOGIES INC

1 patent
US9163732B2Oct 20, 2015

Magnetic fluid seal with precise control of fluid volume at each seal stage

RIGAKU TECHNOLOGIES INC0 citations43

HELGELAND WALTER

1 patent
US8720900B2May 13, 2014

Magnetic fluid seal with shunt element

HELGELAND WALTER0 citations33