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:
Apr. 07, 1987
Filed:
Apr. 02, 1986
Manuel A Russo, Holliston, MA (US);
William Richards, Medway, MA (US);
Millipore Corporation, Bedford, MA (US);
Abstract
The invention resides in a compound valve having utility in a sample injector for a liquid chromatograph. The valve has a pair of rotary spool valves (52, 54), each valve has a shaft (60) with an axial bore (64) in one end and a radial bore (66) communicating with the axial bore. A valve seal (70) surrounds the shaft. A pair of radial passageways (77, 78) in the seal are aligned diametrically and lie in a common plane with the radial bore (66) in the valve shaft. A pinion (62) is fixed to each shaft and a common driving gear (68) engages each pinion to rotate both shafts simultaneously through 180.degree. to place the radial bores in the shafts in communication selectively with either radial passageway in the valve seals.