Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Module-code verification layer to automatically validate user input
Light barrier and method for detecting objects
Method and system for fail-safe call survival
Nonvolatile memory device
Toy
Communication device and two-dimensional communication system using the same
Antibodies to Clostridium difficile toxins
  Randomly Featured Patents
Communication system for transmitting data between a transmitting antenna utilizing a phased array antenna and a receive antenna in relative movement to one another
Body action information system
Method of bonding inner leads to chip pads
System and method for rapid testing of intermittently operated devices
Timepiece with dial having a rotary index
Navigation device
Switched power supply converter with a piezoelectric transformer
Rotating electrical machine and manufacturing method thereof
Nano-electromechanical high-index contrast
Method and apparatus for alarming in a power supply modulated system