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. 25, 1979
Filed:
Dec. 23, 1977
Ahmad Abu-Shumays, CA, US;
Varian Associates, Inc., Palo Alto, CA (US);
Abstract
This thermostatable flow cell for fluorescence measurements enables rapid thermal equilibration and precise temperature control. For a flow cell volume of less than 20 microliters, a selected temperature in the range up to 20.degree. C. above ambient can be attained within five seconds, and this selected temperature can be maintained stable within 0.1.degree. C. The cell comprises a cylindrical cavity whose walls include a metallic portion for heat conduction and a transparent window portion for light acceptance and fluorescence observation. The metallic portion of the cell is formed from a cell block to which a temperature sensing means is affixed. The window portion is affixed to the cell block by an inert bonding material. A thermoelectric device responsive to the temperature sensing means causing heating or cooling of the cell block as necessary to provide thermal equilibration at the selected temperature.