Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Business
Class Information
Number: 434/340
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 > Part of electric circuit completed when examinee places free element in contact with another element
Description: Subject matter wherein a freely movable element (e.g., a conductive disk) causes an electric circuit to be completed if placed at a correct answer location on some element.










Sub-classes under this class:

Class Number Class Name Patents
434/341 Correct answer indicator lamp carried by free element 8


Patents under this class:

Patent Number Title Of Patent Date Issued
6755655 Electronic educational toy appliance and a portable memory device therefor Jun. 29, 2004
6739874 Electronic educational toy appliance teaching letters words and numbers May. 25, 2004
6729881 Electronic educational toy appliance and a portable memory device therefor May. 4, 2004
5906369 Electronic matching game apparatus including sound generating means and method of game play using the same May. 25, 1999
5334022 Auditory playing device Aug. 2, 1994
5330358 Computerized educational and entertainment device Jul. 19, 1994
5161977 School subject learning aid and tutor Nov. 10, 1992
5011412 Educational keyboard with removable keys Apr. 30, 1991
4968255 Electronic instructional apparatus Nov. 6, 1990
4921427 Educational device May. 1, 1990
4893817 Musical jigsaw-type puzzle Jan. 16, 1990
4863386 Child's learning calendar Sep. 5, 1989
4824376 Educational device Apr. 25, 1989
4802092 Electric probe used to activate correct and incorrect response areas in an instructional apparatus Jan. 31, 1989
4526550 Combination system and question and answer matching game Jul. 2, 1985
4525148 Multi-modal educational and entertainment system Jun. 25, 1985
4514176 Automatic teaching apparatus and method Apr. 30, 1985
4385762 Electronic matching and information association game May. 31, 1983
4348191 Electronic game board Sep. 7, 1982
4272896 Educational toy Jun. 16, 1981
4246827 Device for teaching music Jan. 27, 1981
4121355 Learning device Oct. 24, 1978
4069597 Question and answer game Jan. 24, 1978
4067121 Educational game Jan. 10, 1978
4023807 Electric game set May. 17, 1977











 
 
  Recently Added Patents
Device and method for superimposing patterns on images in real time, particularly for guidance by location
Image stabilization
Point-of-sale server and method
Methods of isolating bipotent hepatic progenitor cells
Method and structure for adding mass with stress isolation to MEMS structures
Bottle
Method and composition for attracting arthropods by volatizing an acid
  Randomly Featured Patents
Communications apparatus
MR device provided with differently optimized RF coil arrays
Allyl or methallyl-bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid imides and bisimides
Electrical power management system
Operating means for photographic cameras
Connector for printed circuit board
Single crystal silicon tiles for display panels
Cosmetic composition containing N-acyl neutral amino acid esters of lower alcohols
Steel sheet excellent in workability
N',N"-dialkylguanidino dipeptides