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:
Jun. 16, 1992
Filed:
May. 11, 1990
John A Christianson, Mountain View, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An apparatus for capillary zone electrophoresis having a selectively removable capillary cassette, the internal walls of which define a toroidal capillary region and a gas flow path therethrough. Within the capillary region is housed a helically wound capillary tube having an inlet end and an outlet end. An electrical field is applied across the ends of the tube to cause electrophoretic separation of molecules of a sample. A stream of pressurized gas, preferably air, is channeled through the capillary region for cooling of the tube. The gas flow is a transverse flow and is channeled to avoid differentiation in cooling capacity. The transverse cross-sectional area of the gas flow path is substantially uniform throughout to prevent change in flow velocity. The gas flow path is a generally U-shaped path having a smooth radius turn. In progressing through the capillary region, the stream of gas is caused to flow at an angle relative to the axis of the helix, thereby promoting thermal isolation of succeeding loops of the helically wound capillary tube.