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
Accordion bioreactor
Electrode assembly with centrally wound separator member
Pet fish burial pod
Automatic adjustment of devices in a home entertainment system
Electronic device, information processing method, and storage medium
Semiconductor device having germanium active layer with underlying parasitic leakage barrier layer
Compound containing a carbon or an oxygen isotope, preparation and use thereof, and composition comprising thereof
  Randomly Featured Patents
Electrolytic cell with differential gas pressure control device
Curable polyene-polythiol compounds and methods for preparation and curing
Apparatus for measuring differential impedances
Method for anti-aliasing of electronic ink
Sprayable silicone emulsions which form elastomers having smoke and fire resistant properties
Method and apparatus for clock recovery
Positioning control system for rock drill support apparatus
Method of preventing the accumulation of micro-organisms in thermal energy conversion systems
Diazonium functionalized nanoparticles and methods for binding nanoparticles to metallic surfaces
Method and mobile radio telephone network for handling a packet data service