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:
Dec. 22, 1998
Filed:
Jan. 21, 1997
Applicant:
Inventors:
Masahiro Hiraishi, Kyoto, JP;
Toshihiko Yoshida, Uji, JP;
Hiroaki Waki, Kyoto, JP;
Sunao Yoshida, Kyoto, JP;
Shinichi Kuroda, Ibaraki, JP;
Assignee:
Shimadzu Corporation, Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
250292 ; 313256 ;
Abstract
A quadrupole mass filter, or a multiple-pole mass filter in general, composed of a cylindrical main body made of an insulating material and having a star-shaped cross-sectional profile whose inward bulges are curved substantially hyperbolic, and four electrode layers of a high melting point metal deposited by a chemical vapor deposition (CVD) process. The four electrode layers are separated at the outward bulges of the star-shaped cross-sectional profile. The quadrupole mass filter has pre-rod electrodes.