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. 26, 1982
Filed:
Mar. 25, 1980
Applicant:
Inventors:
William H Slavik, Palos Hills, IL (US);
William P Carlson, Chicago, IL (US);
Michael J McGowan, Downers Grove, IL (US);
Assignee:
Nuvatec, Inc., Lombard, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
G09B / ; G09B / ;
U.S. Cl.
CPC ...
434335 ; 434362 ;
Abstract
A teaching device includes a reading station provided with six on-off switches for automatically sensing a text key encoded as a pattern of punched holes in a text book. The teaching device automatically generates an answer key from the text key by means of a pseudo-random number generator which is run using the text key as a seed. The text book includes a number of multiple choice questions in which the correct answer corresponds to the answer designated in the answer key.