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. 14, 1982
Filed:
May. 06, 1981
Applicant:
Inventor:
Gerd Kuhfus, London, CA;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ; 179 / ; 362 24 ; 3403 / ; 200314 ;
Abstract
A pushbutton dial having pushbuttons arranged in three columns and four rows has the buttons illuminated by four LED's positioned in a light-guide plate having apertures which surround the pushbuttons. The LED's are in recesses at intersections of the outer columns and top and bottom rows, each recess between four adjacent apertures. Guide grooves at the edges of the plate redirect light issuing from the LED's and passing between apertures. The plate is transparent and the buttons translucent, the buttons being illuminated from all round their peripheries.