The sensor is formed of a plastic material such as high density polyethylene which has a high coefficient of...http://www.google.com/patents/US5313801?utm_source=gb-gplus-sharePatent US5313801 - Cryostat throttleAdvanced Patent SearchPublication numberUS5313801 APublication typeGrantApplication numberUS 07/909,777Publication dateMay 24, 1994Filing dateJul 7, 1992Priority dateJul 7, 1992Fee statusL