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. 18, 2003
Filed:
Dec. 03, 2001
Tim M. Hoberock, Boise, ID (US);
Angela K. DiFronzo, Longmont, CO (US);
John W. Huffman, Meridian, ID (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A resonance chamber is provided in a printing device, or in a print medium supply tray of the printing device, to determine the size of the print medium in the printing device. The supply of print medium and the resonance chamber are positioned so that the print medium covers a portion of the resonance chamber. An audio signal system then emits an audio signal to drive the resonance chamber. The frequency of the audio signal is varied until the natural resonance frequency of the chamber, as partially covered by the print medium, is discovered. The resonance frequency of the chamber will correspond to the amount of the chamber that is covered by the print medium and, hence, to the length (or width) of the print medium. In this way, the size of the print medium, whether standard or custom, can be determined.