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. 29, 1976
Filed:
Dec. 09, 1974
Karl-Heinz Weber, Witten-Heven, DT;
Hans Nohendorf, Dorsten, DT;
Abstract
Low voltage direct current power is provided on a mining machine that is supplied with high voltage alternating current by an external power cable. An intrinsically-safe battery is charged by a battery charger that is powered through a stepdown transformer by the high voltage current supplied to the machine only during the actual operation thereof. The battery powers two separate electrical systems and in one system low voltage current continuously powers essential electrical devices that must remain functional even though the mining machine is not performing a mining operation. The other electrical system powers electrical devices that are essentially operative only when the mining machine is operative and this system is automatically deenergized by a relay in the high voltage current supply line.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile