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:
Nov. 20, 1990
Filed:
Jun. 30, 1989
Applicant:
Inventor:
Kevin M Walsh, Franklin, MA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B63B / ;
U.S. Cl.
CPC ...
440 88 ; 123585 ; 114270 ; 440-1 ;
Abstract
A self-propelled portable watercraft, including a deck and hull, an engine, and a waterjet propulsion system, capable of operating while a supply of air is unavailable. The air substitute, consisting of a mixture of oxidizing gas and recycled exhaust gas, is delivered to the engine through a self-actuated control valve. In addition, the waterjet propulsion system is equipped with an intake port at the terminus of a narrow, elongated, hollow downward extension of the hull. The purpose of the extension being to minimize the occurrence of a loss of thrust which can result when the craft is vertically displaced above the surface of the surrounding water.