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:
Mar. 04, 2008
Filed:
Oct. 02, 2003
Nobuhito Miyashita, Tokyo, JP;
Kozo Matake, Tokyo, JP;
Nobuhito Miyashita, Tokyo, JP;
Kozo Matake, Tokyo, JP;
Ebara Densan Ltd., Tokyo, JP;
Ebara Corporation, Tokyo, JP;
Abstract
A screw pump includes a pair of screw rotors () having teeth which are held in mesh with each other for drawing and discharging a fluid by rotating the screw rotors () synchronously in opposite directions. The teeth of the screw rotors () have the same shape as each other and are coiled helically in opposite directions. The teeth of the screw rotors () have an axial tooth profile which allows a pair of facing teeth surfaces T of the screw rotors () to be brought into contact with each other only at a pitch line P when the pair of facing teeth surfaces T are brought into contact with each other.