Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9816617 | Magnetic fluid seal with precise control of fluid volume at each seal stage | Walter Helgeland | 2017-11-14 |
| 9163732 | Magnetic fluid seal with precise control of fluid volume at each seal stage | Walter Helgeland | 2015-10-20 |
| 8430409 | Magnetic fluid seal with precise control of fluid volume at each seal stage | Walter Helgeland | 2013-04-30 |
| 8382118 | Magnetic fluid seal with centering of bearing and shaft by compressible member | Walter Helgeland | 2013-02-26 |
| 6199867 | Rotary motion feedthrough device | Walter Helgeland | 2001-03-13 |
| 5625141 | Sealed parts leak testing method and apparatus for helium spectrometer leak detection | Glenn E. Ruiz, Jack W. Farmer, Thomas L. Pflanz, William D. Hall, Roy F. PARSONS | 1997-04-29 |