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Systems and methods of recording piston rod position information in a magnetic layer on a piston rod

  • US 6,989,669 B2
  • Filed: 05/06/2004
  • Issued: 01/24/2006
  • Est. Priority Date: 05/06/2003
  • Status: Expired due to Term
First Claim
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1. A method for sensing a position of a piston rod moving within a cylinder, the method comprising:

  • forming a magnetically hard layer on the piston rod to provide a recording medium for storing information;

    magnetically recording a magnetic pattern in the magnetically hard layer;

    reading the magnetic pattern recorded in the magnetically hard layer while the piston rod is moving; and

    determining from the read magnetic pattern an instantaneous position of the piston rod with respect to the cylinder.

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