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:
May. 15, 2012
Filed:
Jul. 23, 2007
W. Gary Sokolich, Newport Beach, CA (US);
Stephen D. Gilder, Chula Vista, CA (US);
Bradley K. Witt, Chula Vista, CA (US);
Claes Ingemar Haglund, Ödåkra, SE;
W. Gary Sokolich, Newport Beach, CA (US);
Stephen D. Gilder, Chula Vista, CA (US);
Bradley K. Witt, Chula Vista, CA (US);
Claes Ingemar Haglund, Ödåkra, SE;
Sperian Hearing Protection, LLC (Delaware Limited Liability Company), San Diego, CA (US);
Abstract
A headphone that is especially useful to test the efficacy of an earplug installed in an ear canal, by using the headphone to produce sound and by sensing sound pressure at the ear drum despite the presence of the earplug. Applicant uses the speaker () in the headphone to produce a smooth and reasonably 'flat' frequency response by reversing the speaker orientation. In the reversed orientation, the front side of the speaker diaphragm () faces into the headphone cup and away from the ear. The rear side of the speaker that has a circle of holes (), faces toward the ear. The headphone frame has a cylindrical passage () for carrying sound to the person's ear, which has an outer end () that is tapered to encompass the holes in the speaker back side (). The axial distance (L) from the speaker rear side to the ear, is at least 0.6 inch to accommodate the protruding end of an earplug.