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:
Aug. 12, 1980
Filed:
Jun. 08, 1978
Anton Dinkelbach, Gelsenkirchen, DE;
Karl-Heinz Weber, Witten-Heven, DE;
Abstract
Mining equipment of the type operably dependent on the voltage and/or the phase of electric current is isolated from electric supply mains by an OFF switch in a control circuit before a current supply relay drops out. The OFF switch and an ON switch are coupled in a monitoring conductor which supplies current to a photo-electronic coupler. An output signal from the coupler is delivered to a battery fed integrator to provide a control signal to an output relay for a switch in the current supply line on mining equipment. The ON switch is bridged by a normally closed switch coupled to a relay which is responsive to operating current fed to the machine. In a second embodiment, thermal sensing elements for motor windings on the machine provide a signal to battery fed relays to open a normally closed switch in a circuit bridging the photo-electronic coupler.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile