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. 06, 1999
Filed:
Sep. 09, 1997
Paul G Conley, St.Charles, MO (US);
Jeff Merwin, St.Charles, MO (US);
Tyco Group S.a.r.l., , LU;
Abstract
The present invention relates to an electronically monitored mechanical pipette which includes a transducer assembly for monitoring the rotational movement of a volume delivery adjustment mechanism of the pipette. The transducer assembly preferably includes at least two Hall-effect transducers spaced 90 rotational degrees apart from each other and sense the magnetic field of an annular magnet attached to the delivery adjustment mechanism. The Hall-effect sensors produce sinusoidal signals which are 90.degree. out of phase from each other when the magnet rotates relative thereto. The two out of phase sinusoidal signals are processed by an electronics assembly of the pipette to determine the absolute position of the volume delivery adjustment mechanism and compute a fluid volume delivery setting of the pipette. The transducer assembly in conjunction with the electronics assembly monitors both the number of revolutions of the volume delivery adjustment mechanism from an initial zero position, but also the position of the volume delivery adjustment mechanism within a revolution.