Ferrofluid seal incorporating multiple types of ferrofluid
US6899338B2 · kind B2 · utility
5Cited by
16References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2003 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Apr 10, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/43
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ferrofluid seal apparatus incorporating a multi-stage ferrofluid rotary seal adapted to provide a ferrofluid pressure-type seal about a shaft element extending between a first environment and a second environment, a first magnetic fluid disposed at one stage of the multi-stage rotary seal that faces the first environment, and a second magnetic fluid disposed at another stage of the multi-stage rotary seal that faces the second environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.