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Class Information
Number: 434/343
Name: Education and demonstration > Question or problem eliciting response > Correctness of response indicated to examine by self-operating or examinee actuated means > By means including electrical component > Size or shape of, or aperture in, free element controls indication of response correctness
Description: Subject matter wherein a freely movable element (e.g., card, etc.) has a distinctive configuration, a perforation, or other physical characteristic which is indicative of the correct response to a question or problem.










Patents under this class:

Patent Number Title Of Patent Date Issued
7864986 Optical mark reading that uses a disregard state as part of an unambiguous symbology of marks to fill into response bubbles Jan. 4, 2011
5906369 Electronic matching game apparatus including sound generating means and method of game play using the same May. 25, 1999
5634799 Educational apparatus Jun. 3, 1997
5055053 Computer toy Oct. 8, 1991
4435164 Didactic apparatus providing for tutelage of responses through inculcation Mar. 6, 1984
4280809 Educational toy Jul. 28, 1981
4085523 Teaching machine Apr. 25, 1978
4051608 Teaching machine Oct. 4, 1977
4027402 Novel educational toy Jun. 7, 1977
3977092 Teaching machine card Aug. 31, 1976
3974575 Teaching machine Aug. 17, 1976











 
 
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