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:
Sep. 02, 2008
Filed:
Oct. 20, 2005
Bernd Wenderoth, Birkenau, DE;
Stefan Dambach, Haβloch, DE;
Ladislaus Meszaros, Mutterstadt, DE;
Uwe Fidorra, Wachenheim, DE;
Bernd Wenderoth, Birkenau, DE;
Stefan Dambach, Haβloch, DE;
Ladislaus Meszaros, Mutterstadt, DE;
Uwe Fidorra, Wachenheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Methods for cooling a fuel cell include providing in a fuel cell coolant system an aqueous fuel cell coolant composition having an initial electrical conductivity of at most 50 μS/cm. The fuel cell coolant compositions include an alkylene glycol and water solution, and an additive consisting of one or more five membered heterocyclic compounds (azole derivatives) having 2 or 3 heteroatoms selected from the group consisting of nitrogen and sulfur, which contain no or at most one sulfur atom and which may carry a fused aromatic or saturated six-membered ring, and an orthosilicate in an amount to provide a silicon content of from 2 to 2000 ppm by weight.