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. 28, 1992
Filed:
May. 01, 1991
Applicant:
Inventors:
Ralph C Griffin, Jr, Los Alamitos, CA (US);
John F Ramo, Cypress, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F03D / ;
U.S. Cl.
CPC ...
416 87 ; 416119 ; 4161 / ;
Abstract
A drum is mounted for rotation about an axis. Its surface is substantially cylindrical about the axis, and axially mounted outside of the surface is a plurality of vanes each defining a slot with respect to the surface. The slot is an aerodynamic slot where accelerating air decreases pressure to produce thrust which is in the direction of rotation. The outer surface of the drum is not quite cylindrical, but is shaped to be of larger diameter at the slot to enhance Venturi action.