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:
Apr. 28, 2009
Filed:
May. 16, 2003
Brad N. Mathiowetz, Lakeville, MN (US);
Christopher P. Kantzes, Minneapolis, MN (US);
Gregory J. Opheim, St. Paul, MN (US);
Brad N. Mathiowetz, Lakeville, MN (US);
Christopher P. Kantzes, Minneapolis, MN (US);
Gregory J. Opheim, St. Paul, MN (US);
Fisher-Rosemount Systems, Inc., Austin, TX (US);
Abstract
A memory authentication technique for field maintenance tools is provided. A non-volatile electronic memory includes a unique software identifier. A non-reversible algorithm is applied to the unique software identifier to obtain a result. The result is then encrypted and compared with a stored encrypted result previously stored on the electronic memory. Based upon this comparison, the tool can be fully enabled, fully disabled, or selectively enabled.