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. 21, 2003
Filed:
Sep. 06, 2001
Chun-chien Chen, Hsinchu Hsien, TW;
Tean-mu Shen, Hsinchu, TW;
Jung-chen Chien, North, TW;
Ming-Hsin Liu, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A combination double screw rotor assembly includes a first and a second screw rotor arranged in parallel in a casing, two sets of bearings respectively mounted in the casing near the outlet to support the shafts, and a plurality of locking means respectively fastened to the shafts near the inlet. The first and the second screw rotor each has a low pressure screw rotor element, a high pressure screw rotor element, and a spiral thread formed of a first spiral thread segment at the high pressure screw rotor element and a second spiral thread segment at the low pressure screw rotor element, the first spiral thread segment having an uniform short pitch, the second spiral thread segment having an uniform long pitch, the first spiral thread segment and second spiral thread segment of the first and the second screw rotor being respectively meshed together.