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Apparatus for determining the position of a movable mechanical element and method of marking a mechanical element

  • US 6,452,158 B1
  • Filed: 04/01/1999
  • Issued: 09/17/2002
  • Est. Priority Date: 04/02/1998
  • Status: Expired due to Term
First Claim
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1. A mechanical element comprising an optically readable marking, the optically readable marking comprising a surface and a plurality of areas, the surface having a first reflectivity and the plurality of areas having a second reflectivity, wherein a substrate is disposed between the mechanical element and the surface, and wherein the surface comprises chromium and wherein the substrate comprises bronze, and further wherein each of the plurality of areas comprises an exposed area of the substrate.

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