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
Maltol ether processes and intermediates
Digital photographing apparatus
Compositions and methods for lowering triglycerides in a subject on concomitant statin therapy
Method and apparatus for establishing a media clip
Pre and post-paid real time billing convergence system
System, method, and software for researching, analyzing and comparing expert witnesses
Multi charged particle beam writing apparatus and multi charged particle beam writing method
  Randomly Featured Patents
Dual fuel system for automobiles
Trivet
Guidewire extension with sliding release mechanism
Display apparatus
Recombinant mistletoe lectin
Asynchronous digital circuits including arbitration and routing primitives for asynchronous and mixed-timing networks
Devices and method for bundling a stack of sheet-type objects
Corrosion protective band for underground pipe joints with metal parts
Offshore drilling platform with vertically movable legs
Vehicle mirror base