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:
Oct. 17, 1995
Filed:
Dec. 27, 1993
Richard P Bolger, Schaumburg, IL (US);
Steve Dumbovic, Elmhurst, IL (US);
Illinois Tool Works, Inc., Glenview, IL (US);
Abstract
A switch circuit for selectively driving a LED display at either a dim or bright intensity in response to varying input voltages is provided. The switch circuit includes a current regulator device which is responsive to a reference voltage and is coupled to a LED display device for supplying a first level of constant current therethrough so as to illuminate the display device at a dim intensity and for supplying a second level of constant current therethrough so as to illuminate the display device at a bright intensity. A controllable switching device is responsive to input voltages of a wide varying range for being selectively turned on and off and for generating the reference voltage.