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
Data center management unit with improved disaster prevention and recovery
Soybean sequences associated with the FAP3 locus
Method for detecting motion of an electrical device or apparatus
Tri-material dual-species neutron spectrometer
Segmentation of a product markup image based on color and color differences
Semiconductor memory device
Systems and methods for providing a video playlist
  Randomly Featured Patents
Method for heat treatment of milk and the like
Image reading and recording apparatus
Method for preventing AIDS in a subject or treating a subject infected with the AIDS virus
Adaptive scan control having horizontal scan locked clock system
Data-transition threshold following in optical recording
Apparatus for polishing semiconductor wafers and method of testing same
Sample tray heater module
Semiconductor device with capacitor and method of manufacturing thereof
Straight through cement mixer