Resources Contact Us Home
Browse by Category: Main > Business
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

  Recently Added Patents
Wound dressing with a discontinuous contact layer surface
Method and apparatus for predicting object properties and events using similarity-based information retrieval and modeling
Signal judgment method, signal judgment apparatus, program, and signal judgment system
2-aryl-4-quinazolinones and their pharmaceutical compositions
Optical writer and image forming apparatus including same
Method and system for delivering and executing virtual container on logical partition of target computing device
System and method for combined I/Q generation and selective phase interpolation
  Randomly Featured Patents
Built-in parking locking device of vehicle
Rudder angle indicator system with active sector sensing
Brake adjustment monitor device for automotive vehicles
Open terminal connector, method of fabrication of same
Methods for supplying cryptographic algorithm constants to a storage-constrained target
Control valve for vessel gas water heater
Physical motion state evaluation apparatus
System for seaming high-modulus, high-tenacity, low-elongation fabrics
Partially-overcoated elongate contact structures
Optical sensors for the measurement of oxygen