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. 16, 2016
Filed:
Jul. 08, 2015
Applicant:
Doppler Labs, Inc., New York, NY (US);
Inventors:
Dan Wiggins, Montecito, CA (US);
Jonathan Oswaks, Thousand Oaks, CA (US);
Assignee:
Doppler Labs, Inc., San Francisco, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61F 11/06 (2006.01); G10K 11/16 (2006.01); H03B 29/00 (2006.01); H04R 1/10 (2006.01); G10L 21/0232 (2013.01); G10L 21/0208 (2013.01); H03G 3/32 (2006.01); H04R 1/22 (2006.01); H03G 9/02 (2006.01); H03G 5/16 (2006.01); H04R 3/04 (2006.01); G10K 11/04 (2006.01); A61F 11/08 (2006.01);
U.S. Cl.
CPC ...
H04R 1/1083 (2013.01); A61F 11/08 (2013.01); G10K 11/04 (2013.01); G10K 11/16 (2013.01); G10L 21/0208 (2013.01); G10L 21/0232 (2013.01); H03G 3/32 (2013.01); H03G 5/165 (2013.01); H03G 9/025 (2013.01); H04R 1/22 (2013.01); H04R 3/04 (2013.01); A61F 2011/085 (2013.01); H04R 1/1008 (2013.01); H04R 1/1016 (2013.01);
Abstract
A passive acoustical filter includes a first opening to receive ambient sound, a second opening to output filtered sound, and a first low pass filter element coupled between the first opening and the second opening. The first low pass filter element includes a first expansion chamber filled with a material in which a speed of sound is lower than a speed of sound in air.