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Class Information
Number: 434/203
Name: Education and demonstration > Mathematics > Arithmetic > Apertured elements threaded on elongate means (e.g., abacus, etc.)
Description: Subject matter including apertured pieces through all of which a wire, a rod, or the like extends.










Sub-classes under this class:

Class Number Class Name Patents
434/204 Elements manually placed on or removed from elongate means during use 10


Patents under this class:

Patent Number Title Of Patent Date Issued
8672683 Computer-based abacus training system Mar. 18, 2014
8449299 Teaching device and method May. 28, 2013
8021159 String math manipulative system and method Sep. 20, 2011
7828553 Mathematics teaching aid Nov. 9, 2010
7815191 Equals: the game of strategy for the basic facts Oct. 19, 2010
7300286 Educational tool Nov. 27, 2007
7077655 Calculation training tool, and calculation training system Jul. 18, 2006
D513762 Abacus Jan. 24, 2006
6712614 Abacus calculator Mar. 30, 2004
6676415 Teaching aid Jan. 13, 2004
6561415 Calorie management system May. 13, 2003
6551110 Visual educational device for teaching literacy Apr. 22, 2003
6375468 Educational tool Apr. 23, 2002
6171111 Educational device for illustrating mathematical relationships Jan. 9, 2001
6129551 Mathematical graph board Oct. 10, 2000
6099377 Toy attachment for child's play pen Aug. 8, 2000
5769639 Multi-educational device Jun. 23, 1998
5725380 Combination writing board and abacus Mar. 10, 1998
5423682 Numbering system teaching aid Jun. 13, 1995
5395245 Elastic pattern abacus and tool for changing arrangement of abacus beads Mar. 7, 1995
5382165 Calorie counter device and method for use Jan. 17, 1995
5377998 Machine to track game effects Jan. 3, 1995
5334026 Manual sliding calculator Aug. 2, 1994
5299806 Educational device Apr. 5, 1994
RE34498 Manual teaching calculator Jan. 4, 1994
5205747 Bead calculator educational toy Apr. 27, 1993
5190459 Child's behavioral calendar apparatus Mar. 2, 1993
5149269 Manual teaching calculator Sep. 22, 1992
D321906 Calculating device Nov. 26, 1991
4993952 Arithmetic counter Feb. 19, 1991
4884973 Mathematic teaching aid Dec. 5, 1989
4812124 Hexadecimal abacus Mar. 14, 1989
4629429 Abacus with each counter held in position by friction or magnetic attraction Dec. 16, 1986
4466799 Cuboid block, instructional device for multiplication tables Aug. 21, 1984
4448579 Arithmetic instruction apparatus May. 15, 1984
4233757 Mathematics device Nov. 18, 1980
4210093 Counting device Jul. 1, 1980
4176472 Numbers teaching aid Dec. 4, 1979
3995378 Mathematics visual teaching aid Dec. 7, 1976











 
 
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