US 6,981,373 B2
Buoyancy engine
Mark Douglas Robinson, 2500 NE. 201st Ave., Unit 61, Fairview, Oreg. 97024-9725 (US)
Filed on May 14, 2004, as Appl. No. 10/845,186.
Prior Publication US 2005/0252207 A1, Nov. 17, 2005
Int. Cl. F03C 1/00 (2006.01); F04B 17/00 (2006.01)
U.S. Cl. 60—496 20 Claims
OG exemplary drawing
 
16. A method of generating power using a buoyancy engine, comprising the steps of:
(a) moving a slide valve to a first position that allows liquid to enter an upper casing and surround a variably ballasted power piston;
(b) purging liquid from an interior of the variably ballasted power piston, making it buoyant;
(c) movement of the variably ballasted power piston in a power stroke;
(d) transfer of energy by the movement from the variably ballasted power piston to an output device and a liquid discharge piston;
(e) moving the slide valve to a second position that allows liquid to drain from the upper casing into an interior of the liquid discharge piston;
(f) purging liquid from the interior of the liquid discharge piston; and
(g) returning to step (a).