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:
Jul. 24, 2018
Filed:
Dec. 13, 2016
Northrop Grumman Systems Corporation, Falls Church, VA (US);
Jonathon J. Linch, Los Angeles, CA (US);
Scott R. Sorbel, Redondo Beach, CA (US);
Northrop Grumman Systems Corporation, Falls Church, VA (US);
Abstract
An exemplary apparatus attenuates sound in a frequency range, e.g. audible frequencies. A resilient planar membrane has first and second honeycombs with unit cells attached to opposing sides of the planar membrane. Each unit cell has rigid walls extending perpendicular to the planar membrane. Buttresses are mounted inside the unit cells where dimensions of the buttresses result in an alteration of an attenuation versus frequency characteristic in the audible or other frequencies relative to an attenuation versus frequency characteristic without the buttresses.