Resources Contact Us Home
Browse by Category: Main > Business
Class Information
Number: 434/330
Name: Education and demonstration > Question or problem eliciting response > Correctness of response indicated to examine by self-operating or examinee actuated means > Involving magnetic attraction
Description: Subject matter wherein the correctness of the examinee"s response involves the attraction of magnetic materials.

Patents under this class:

Patent Number Title Of Patent Date Issued
5954514 Talking album for photographic prints Sep. 21, 1999
5820383 Magnetic manipulatives book Oct. 13, 1998
5707240 Album with means for magnetically determining page position Jan. 13, 1998
5707238 Number and math education system Jan. 13, 1998
4893817 Musical jigsaw-type puzzle Jan. 16, 1990
4824376 Educational device Apr. 25, 1989
4609356 Rearrangeable form board with sensory feedback Sep. 2, 1986
4536160 Computer keyboard educational toy Aug. 20, 1985
4464125 Magnetic toy cart Aug. 7, 1984
4268978 Automatic sound-emitted self-learning toy May. 26, 1981
4182052 Educational toy Jan. 8, 1980
4180920 Arrangement toy for signalling proper arrangement of elements Jan. 1, 1980
4118877 Educational toy Oct. 10, 1978

  Recently Added Patents
Method for etched cavity devices
Linear book scanner
Three-dimensional shape data processing apparatus and three-dimensional shape data processing method
Mounting structure, electro-optical apparatus, and touch panel
Method and system for providing geohazard information to customers
Method and assembly for determining the temperature of a test sensor
Event-associating software application for accessing digital media
  Randomly Featured Patents
Method and apparatus of cooling heat-treated work pieces
Method and apparatus for I/Q mismatch calibration in a receiver
Wheel or wheel cover
Semiconductor device comprising through-electrode interconnect
Combined suction, irrigation and electrosurgical handle
Cathode-ray tube shadow mask for low overscan
Mirror mounting assembly
Electrically enhanced aqueous filter and method therefor
Radiant electric heater with fabric covering sheet
Gas liquid tower structure