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. 12, 2000
Filed:
Aug. 12, 1999
Warren E Gilson, Madison, WI (US);
Robert E Gilson, Middleton, WI (US);
Other;
Abstract
A pipette for transferring liquid samples includes a body having a handle and a base. A piston assembly is axially movable in the body. A movable lower stop is placed in the path of the piston assembly to stop the piston to limit the length of an intake stroke and is withdrawn from the path to permit axial overtravel during a discharge stroke. The lower stop is positively controlled by a manually operated mechanism including a stop control push button at the top of the handle in front of a piston push button. A mechanism for ejecting a tip from the base includes a lever at the top of the handle providing a mechanical advantage when pressed at either end. In an alternate embodiment, a dual spring overtravel arrangement is used, with the piston return spring telescoped within the overtravel spring.