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. 06, 1977
Filed:
Sep. 27, 1974
Philip Charles Sefton, London, EN;
Kenneth Ernest Chad, Bushey Heath, EN;
Thorn Domestic Appliances (Electrical) Limited, London, EN;
Abstract
A power control apparatus uses a digital electronic counter to gate a triac for controlling the current supplied to a load. The preferred arrangement is that each of 10 possible counts achievable by the counter corresponds to a particular rate of current supply to the load. The counter may be caused to count up or count down by means of proximity switches mounted on a control panel and optionally includes a reset input. The control panel comprises an insulating glass plate having three pairs of electrodes thereon with the electrodes of each pair being mounted on opposite faces of the plate, each pair of electrodes being associated with a respective one of the count-up, count-down and reset inputs of the counter, the pair associated with the reset input being shaped to surround in the respective plane of the plate the other two electrodes on that surface of the plate.