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:
Mar. 11, 2008
Filed:
Jul. 07, 2005
Christopher L. Osterloh, Waseca, MN (US);
Christopher J. Nagy, Waseca, MN (US);
Christopher L. Osterloh, Waseca, MN (US);
Christopher J. Nagy, Waseca, MN (US);
Itron, Inc., Liberty Lake, WA (US);
Abstract
A dual source real time clock (RTC) synchronization system and method for implementation within automatic meter reading (AMR) systems that provide system-wide device time synchronization. In one embodiment, a microcontroller-implemented RTC counts elapsed seconds from a pre-determined system timestamp using a low-speed, low-accuracy crystal. A second source is used to compensate for the low-speed, low-accuracy crystal. This second source comprises a high speed clock in one embodiment. This dual source RTC system can synchronize the endpoint device.