Tester with virtual ground
US8004782B1 · kind B1 · utility
48Cited by
13References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2009 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Oct 23, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/4555
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tester system includes a tester and a radioactive isotope source. The tester includes a spindle assembly, a disk mounted to the spindle assembly, and a head actuatable over the disk. The radioactive isotope source is positioned in an ionizing location proximate the tester, such that a minimum distance between the radioactive isotope source and an axis of rotation of the disk is less than a radius of the disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.