Inventor · disambiguated record
Walter Helgeland
Also filed as: HELGELAND WALTER
10 granted patents·278 citations·filing 1981–2015
89Inventor score
Files withRIGAKU USA INC3FERROFLUIDICS CORP2HELGELAND WALTER1MAHONEY DAVID G1RIGAKU INNOVATIVE TECH INC1
Top patents by PatentIndex Score
10 records- 0194US5826885AMagnetic fluid sealing deviceRIGAKU USA INC·Filed 1996·Granted Oct 27, 1998·92 cites·22 claims
- 0292US4350560AApparatus for and method of handling crystals from crystal-growing furnacesFERROFLUIDICS CORP·Filed 1981·Granted Sep 21, 1982·92 cites·17 claims
- 0379US4663128APulling head for a crystal growing furnaceFERROFLUIDICS CORP·Filed 1985·Granted May 5, 1987·29 cites·11 claims
- 0468US6199867B1Rotary motion feedthrough deviceRIGAKU USA INC·Filed 1998·Granted Mar 13, 2001·31 cites·20 claims
- 0567US5975536ARotary motion feedthrough with rotating magnet systemRIGAKU USA INC·Filed 1997·Granted Nov 2, 1999·30 cites·18 claims
- 0656US8382118B2Magnetic fluid seal with centering of bearing and shaft by compressible memberRIGAKU INNOVATIVE TECHNOLOGIES·Filed 2009·Granted Feb 26, 2013·1 cites·15 claims
- 0755US8430409B2Magnetic fluid seal with precise control of fluid volume at each seal stageMAHONEY DAVID G·Filed 2008·Granted Apr 30, 2013·3 cites·3 claims
- 0849US9163732B2Magnetic fluid seal with precise control of fluid volume at each seal stageRIGAKU TECHNOLOGIES INC·Filed 2013·Granted Oct 20, 2015·0 cites·10 claims
- 0948US9816617B2Magnetic fluid seal with precise control of fluid volume at each seal stageRIGAKU INNOVATIVE TECH INC·Filed 2015·Granted Nov 14, 2017·0 cites·7 claims
- 1046US8720900B2Magnetic fluid seal with shunt elementHELGELAND WALTER·Filed 2009·Granted May 13, 2014·0 cites·8 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →