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Class Information
Number: 434/337
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 > Light detector
Description: Subject matter wherein the examining means includes a light detecting means (e.g., photocell, etc.).

Patents under this class:

Patent Number Title Of Patent Date Issued
6010339 Toy telephone having phone number teaching system Jan. 4, 2000
5478240 Educational toy Dec. 26, 1995
4990093 Teaching and amusement apparatus Feb. 5, 1991
4731023 Teaching system using prerecorded tape Mar. 15, 1988
4627819 Teaching or amusement apparatus Dec. 9, 1986
4615682 Teaching system utilizing magnetic tape Oct. 7, 1986
4602907 Light pen controlled interactive video system Jul. 29, 1986
4549867 Electronic learning aid with random number modes Oct. 29, 1985
4435164 Didactic apparatus providing for tutelage of responses through inculcation Mar. 6, 1984
4403967 Self teaching instrument Sep. 13, 1983
4358278 Learning and matching apparatus and method Nov. 9, 1982
4282522 Display/memory/control system for forward observer source data Aug. 4, 1981
4259667 Information interchange between an intelligent operator, indicia bearing documents, and responsive apparatus Mar. 31, 1981
4227318 A quiz game with response indication for correct and incorrect answers Oct. 14, 1980
4166325 Didactic apparatus including handheld responsor means Sep. 4, 1979
4033050 Teaching machine having response dependent programming Jul. 5, 1977

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