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:
May. 07, 1996
Filed:
Jul. 29, 1994
Christoph Klaus, Wiesbaden, DE;
Varta Batterie Aktiengesellschaft, Hanover, DE;
Abstract
A carbon-black-containing gas-consuming layer on the surface of a negative electrode is produced from a mixture of an aqueous carbon black dispersion and an aqueous PTFE dispersion, both of which contain a surfactant of the same type (either cationic, anionic or nonionic) for the purpose of stabilization. The stabilized particles in the final gas-consuming dispersion are formed by coating PTFE particles with smaller carbon particles, preferably with an interlayer or envelope of a surfactant film. Pores and cracks operate to increase the effective catalytic surface area for oxygen gas. Additions of polyacrylic acid esters are suitable for adjusting the viscosity of the dispersion. The dispersion is applied to the electrode by immersion or spraying.