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. 09, 2003
Filed:
Apr. 16, 2002
Gerhard Salje, Hamburg, DE;
Eppendrof AG, Hamburg, DE;
Abstract
A method for controlled proportioning of liguids with a postive-displacement device ( ) for dislocating a gas cushion ( ) includes measuring the pressure (p ) in the gas cushion ( ) at the time of a complete discharge of a liquid volume, measuring the discharge time (t ) for a complete discharge of the liquid volume and determining the time demand (&Dgr;t) to compress the gas cushion ( ) by the postive-displacement device by means of the pressure (p ), the dead volume (V ) of the gas cushion ( ), a gas condition equation, and the volumetric gas flow (Q) discharged by the postive-displacement device. A corrected discharge time (t ) is determined as a proportioning control magnitude by a deduction of the time demand (&Dgr;t) from the measured dischage time (t ) with outputting, and/or saving, and/or resorting to the deviation of the corrected discharge time (t ) from a desired discharge time (t ) for regulating the discharge of the liquid volume.