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. 08, 2001
Filed:
Oct. 29, 1998
Gunnar Fredriksson, Bettna, SE;
Anders Norén, Djursholm, SE;
IPS Interproject Service AB, Bettna, SE;
Abstract
A wave energy converter comprises an acceleration tube (,) attached to a buoyant body (,). An intermediate section of the acceleration tube defines a working cylinder (,), with openings in the acceleration tube above and below the working cylinder allowing unobstructed flow of water between the working cylinder and the body of water in which the acceleration tube is immersed. A working piston reciprocates in the working cylinder. A relief passage at each end of the working cylinder is controlled by the working piston to allow unrestricted flow pass the working piston when the piston moves past a predetermined position at the end of the working cylinder. An energy absorbing device (,) is connected to the working piston. A restoring device (,C,,C) is provided to apply a return force to the working piston towards the working cylinder, if and when the working piston moves past the predetermined position.