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. 07, 1989
Filed:
Dec. 17, 1987
Scott P Fulton, Brookline, MA (US);
Douglas B Tiffany, Danvers, MA (US);
W. R. Grace & Co., Lexington, MA (US);
Abstract
A method and apparatus for supplying a preset amount of sample solution to a liquid chromatographic column wherein (1) a first piston, which moves along the axis of a piston container sealingly contacting the side walls of said piston container, is moved a preset distance so as to draw a fixed amount of driving solution from the driving solution chamber of a piston cylinder into the piston container, thus displacing a second piston which moves along the axis of said piston cylinder sealingly contacting the side walls of said piston cylinder and dividing said piston cylinder into a sample solution chamber and a driving solution chamber, said displacement of said second piston serving to cause sample solution to be drawn from a sample solution reservoir into the sample solution chamber of the piston cylinder in a fixed amount equal to the fixed amount of driving solution drawn into the piston container; and (2) driving solution is pumped into said driving solution chamber in order to displace said second piston so that sample solution in the sample solution chamber is forced out of the sample solution chamber and onto said chromatographic column.