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:
Nov. 15, 2016
Filed:
Dec. 31, 2013
Halliburton Energy Services, Inc., Houston, TX (US);
Mark W. Roberson, Research Triangle Park, NC (US);
Craig W Roddy, Duncan, OK (US);
Charles Bartee, Research Triangle Park, NC (US);
Kristopher McGuire, Research Triangle Park, NC (US);
Krishna M Ravi, Kingwood, TX (US);
Ginger Rothrock, Research Triangle Park, NC (US);
Scott Goodwin, Research Triangle Park, NC (US);
Halliburton Energy Services, Inc., Houston, TX (US);
Abstract
A radio frequency identification (RFID) tag can include a die attached to an inductive-capacitive (LC) circuit including a capacitive element coupled to an inductive element. The LC circuit can have a resonant frequency that varies according to properties of fluid proximate the RFID tag. The RFID tag can further include a coating material disposed around the die to form an outer surface of the RFID tag. The coating material may have a thickness over a portion of the LC circuit, to permit a conductivity property of a fluid proximate the outer surface to affect the resonant frequency of the LC circuit such that the resonant frequency shifts to a second resonant frequency. Additional apparatus, systems, and methods are disclosed.