U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Magneto-rheological fluid damper

Patent 6019201 Issued on February 1, 2000. Estimated Expiration Date: Icon_subject July 29, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

2557140

2575360

2635483

2661596

2661825

2663809

2667237

2669325

2692582

2733792

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Inventors

Assignee

Application

No. 901896 filed on 07/29/1997

US Classes:

188/267.1, Electroviscous or electrorheological fluid188/322.15, Piston valve detail (e.g., seat design, structural arrangement, metering element)267/140.14With electronic or magnetic control

Examiners

Primary: Oberleitner, Robert J.
Assistant: Talavera, Melanie

Attorney, Agent or Firm

Foreign Patent References

  • 0 297 608 A1 EP. 01/13/1989
  • 1094516 FR. 05/13/2012
  • 1 084 528 DE. 06/13/1960
  • 3631107 A1 DE. 03/13/1988
  • 3800678 A1 DE. 07/13/1989
  • 58-113644 JP. 07/13/1983
  • 58-221034 JP. 12/13/1983
  • 63-001833 JP. 01/13/1988
  • 63-180742 JP. 07/13/1988
  • 63-210432 JP. 09/13/1988
  • 63-231031 JP. 09/13/1988
  • 5-162524 JP. 06/13/1993
  • 1249229 SU. 08/13/1986
  • 1248875 A1 SU. 08/13/1986
  • 756107 GB. 08/13/2012
  • 1 282 568 GB. 07/13/1972
  • 2 186 947 GB. 08/13/1987

International Class

F16F 015/03

Abstract

A controllable magneto-rheological damper includes a housing; a piston moly disposed in the housing; a cavity defined by the housing and the piston; a passage fluidically coupled to the cavity; a magneto-rheological fluid contained within the cavity, wherein motion of the piston is damped by flow of the magneto-rheological fluid through the passage; and a magnet disposed to produce a magnetic field within the passage with field lines essentially parallel to the passage.

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