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:
Sep. 12, 1978
Filed:
Dec. 19, 1974
Russell I Mason, Doylestown, PA (US);
John R Dale, Willow Grove, PA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A sonobuoy having a directional hydrophone centrally enclosed in a flexib acoustically transparent, spherical bag which upon deployment is filled with water to form a hydrosphere. A first embodiment comprises a plurality of upper and lower spreaders which form the bag into a spherical shape having a valve at the bottom most portion thereof for entry of water into the bag during oscillatory motion of the hydrophone. A second embodiment comprises a flexible, acoustically transparent, spherical bag which is time-filled with water by a pump to inflate the bag to a predetermined pressure. The hydrosphere forms a large virtual mass of static water around the hydrophone which reduces near field affects due to flow and motion noise and which also operates as a sea anchor.