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. 25, 2003
Filed:
Dec. 30, 2002
Applicant:
Inventor:
Richard Lance Willis, Lauderhill, FL (US);
Assignee:
Motorola, INC, Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03G 3/20 ; G01N 2/900 ;
U.S. Cl.
CPC ...
H03G 3/20 ; G01N 2/900 ;
Abstract
In a device having a sound tube and a receiver, a test signal is generated to apply to the receiver. An electrical impedance of the receiver is measured, and a length of the sound tube is estimated by a shift in frequency of at least one of a maximum and a minimum in the electrical impedance.