The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 2008
Filed:
Jun. 14, 2004
Dale Perry, Burnsville, MN (US);
Mark Schumacher, Minneapolis, MN (US);
Garrie Huisenga, Chaska, MN (US);
Randy Longsdorf, Chaska, MN (US);
Dale Perry, Burnsville, MN (US);
Mark Schumacher, Minneapolis, MN (US);
Garrie Huisenga, Chaska, MN (US);
Randy Longsdorf, Chaska, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
A Safety Instrumented System for use with a process control system receives pressure of process fluid in the process piping. A valve positioner positions a valve which controls flow of process fluid through the process piping. The valve positioner is caused to perform a partial stroke of the valve or otherwise introduce a perturbation into the process. A resulting change in sensed pressure due to the perturbation is used to diagnose operation of the process.