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. 15, 1982
Filed:
Oct. 15, 1980
Antony Oliapuram, Frankfurt, DE;
Varta Batterie A.G., Hanover, DE;
Abstract
To activate metallic sintered iron electrodes, ammonium halogenides are suitable as activating means, mixed with the iron powder right from the start, if appropriate together with conductive graphite and an organic pore forming substancesuch as polyvinyl alcohol. They begin to function while still in the paste, and during drying, as well as in the early stages of the sintering process. This can be extended up to two hours at temperatures which are close below the decomposition temperature of the ammonium halogenides (300.degree.-350.degree. C.). After volatilization of the ammonium halogenide, the sintering is completed at the terminal temperature of, for example, 700.degree. C. for one hour and cooling is then performed in an H.sub.2 atmosphere down to room temperature.