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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 |
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