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. 06, 2001
Filed:
Aug. 17, 2000
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
An asymmetric double screw rotor assembly includes two asymmetric screw rotors respectively revolvably meshed together in a casing having an inlet and an outlet, the spiral threads of the screw rotors defining an uniform pitch, the outer diameter of the first screw rotor and the inner root diameter of the second rotor being uniform, the inner root diameter of the first screw rotor gradually increased from the inlet of the casing toward the outlet, the outer diameter of the second screw rotor gradually reduced from the inlet of the casing toward the outlet. Upon respective rotary motion of the screw rotors, the volume of the respective air chambers gradually reduces from the inlet of the casing toward the outlet.