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. 16, 1991
Filed:
Feb. 01, 1990
David P Allen, Morgan City, LA (US);
Other;
Abstract
A neutral buoyancy device, (NBD), includes a lift volume container, load suspension straps, control mechanism, handle, self-closing intake and exhaust valves and valve actuators. A high pressure air source is provided by attaching a pressure cylinder to the NBD or from the surface. The handle is attached to the control mechanism, which is positioned between the lift volume container and load. The control mechanism senses any net difference in lift and load forces and causes the intake valve to open automatically when the load increases, (or as the air volume and lift decrease during descent), and the exhaust valve to open automatically when the load decreases, (or as the air volume and lift increase during ascent). Both valves are self-closing. The user grasps the handle and is able to load or unload the NBD, or transport the load up, down or sideways underwater while neutral buoyancy is automatically maintained.