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. 13, 1976
Filed:
Sep. 09, 1974
Wallace Clark, Indianapolis, IN (US);
Other;
Abstract
A pump composed of a gear pair made up of an inner member having at least one external helical thread, and an outer member having internal helical threads, there being one more internal helical thread in the outer member than the number of threads on the inner member. The inner member is free to gyrate but prevented from rotation, and the outer member rotates on its true axis. The outer member is fixed in a tubular casing having at least one aperture for fluid being pumped, and this member extends beyond the gear pair and constitutes a drive shaft for the pump. The tubular casing is disposed in a housing and is arranged for rotation in the housing on suitable bearings and suitable seals. The housing has a port at each end of said gear pair, so that the direction of pumping may be reversed by reversing the direction of rotation of said drive shaft.