1. U.S. Patent No. 5,198,877 entitled “Wireless optical instrument for position measurement and method of use therefore”
  2. U.S. Patent No. 5,198,877 (Re: 25,816) entitled “Method and apparatus for three-dimensional non-contact shape sensing”
  3. U.S. Patent No. 5,617,857 entitled “Imaging system having interactive medical instruments and methods”.
  4. U.S. Patent No. 5,622,170 entitled “Apparatus for determining the position and orientation of an invasive portion of a probe inside a three-dimensional body”
  5. U.S. Patent No. 5,907,395 entitled “Optical fiber probe for position measurement”
  6. U.S. Patent No. 5,920,395 entitled “System for locating relative positions of objects in three-dimensional space”
  7. U.S. Patent No. 5,987,349 entitled “Method for determining the position and orientation of two movable objects in three-dimensional space”
  8. U.S. Patent No. 6,094,007 entitled “Optical tracking system”
  9. U.S. Patent No. 6,141,104 entitled “System for determination of a location in three dimensional space”
  10. U.S. Patent No. 6,442,416 entitled “Determination of the position and orientation of at least one object in space”.
  11. U.S. Patent No. 6,497,134 entitled “Calibration of an Instrument”
  12. U.S. Patent No. 6,611,141 entitled “Hybrid 3-D probe tracked by multiple sensors”
  13. U.S. Patent No. 7,256,899 entitled “Wireless methods and systems for three-dimensional non-contact shape sensing”
  14. U.S. Patent No. 7,336,375 entitled “Wireless methods and systems for three-dimensional non-contact shape sensing”
  15. U.S. Patent No. 7,742,804 entitled “Means of tracking movement of bodies during medical treatment”

Several patents are currently pending.