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:
Jul. 14, 1987
Filed:
Sep. 09, 1985
Neil J Sheehan, Berkeley, CA (US);
Jon E Oppenlander, Lafayette, CA (US);
Richard P Fleenor, Monte Sereno, CA (US);
Baxter Travenol Laboratories, Inc., Deerfield, IL (US);
Abstract
A multi-volume displacement pipette assembly has a tubular body with a first end for receiving a plunger assembly and a second mounting end for mounting a removable dispensing tip to the tubular body. A first cylindrical chamber extends through the tubular body for holding a first volume of fluid. The first cylindrical chamber opens through the second end of the tubular body. At least one second cylindrical chamber extends through the tubular body for holding a second volume of fluid. The such at least one cylindrical chamber is coaxially aligned with the first chamber and is open through the second end of the tubular body through a fluid pathway extending through the tubular body to the second end. A plunger assembly is coaxially positioned within the tubular body and operatively mounted therein for reciprocal, longitudinal movement. The plunger assembly includes a first portion having an external diameter substantially equal to the internal diameter of the first cylindrical chamber and at least one second portion axially aligned with the first portion and having an external diameter substantially equal to the internal diameter of such at least one second cylindrical chamber. The pipette assembly includes removable dispensing tips which can be mounted on the second end of the tubular body. Depending upon which removable dispensing tip is mounted on the second end, the fluid pathway interconnecting such at least one second cylindrical chamber with the second end is either blocked or open to fluid flow.