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:
Aug. 21, 2007
Filed:
Dec. 15, 1999
Dale Lee Yones, Boulder, CO (US);
Dale Lee Yones, Boulder, CO (US);
The Goodyear Tire & Rubber Company, Akron, OH (US);
Abstract
A variable modulation index for a transponder () capable of measuring one or more parameters (e.g., temperature, pressure) in an object (e.g., a tire, ()) and transmitting a data stream (FIGS.C,B) to an external reader/interrogator (). The transponder typically operates in a passive mode, deriving its power (Vxx, Vcc, Vdd) from an RF interrogation signal received by an antenna system (), but can also operate in a battery-powered active mode. The transponder includes memory () for storing measurements, calibration data, programmable trim settings (), transponder ID and the like. Data stream transmission is preferably accomplished by PSK modulation () of the received RF signal, wherein the magnitude of modulation (index) is programmably varied in binary steps according to the programmed trim settings, and dynamically varied according to the level of input power in order to optimize the transmission. The transmitted signal is cleaned of noise by synchronizing a clock signal with the data stream signal.