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:
Jan. 09, 2007
Filed:
Oct. 06, 2005
Andrew P. Studdert, Wilmette, IL (US);
Michael R. Miller, Winnetka, IL (US);
Andrew P. Studdert, Wilmette, IL (US);
Michael R. Miller, Winnetka, IL (US);
Other;
Abstract
An engine includes at least one cylinder bore having a cylinder wall and a piston positioned within the cylinder bore, and adapted for reciprocal movement therein. At least one piston sleeve is positioned within the cylinder bore, radially between the piston and the cylinder wall. The piston sleeve extends around the piston, and is adapted for reciprocal movement therein. The piston and the piston sleeve are able to move independently of one another. A stop selectively secures the piston sleeve stationary within the cylinder adjacent a top portion of the cylinder. When the stop is de-activated, the piston and the piston sleeve move together within the cylinder, and when the stop is activated, the piston sleeve is secured adjacent the top portion of the cylinder and the piston moves reciprocally within the piston sleeve.