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Class Information
Number: 434/194
Name: Education and demonstration > Mathematics > Arithmetic > Numeric value represented by weight placed on balance
Description: Subject matter including a weight which represents a numeric value and which is placed on a balance to illustrate a mathematical relationship.

Patents under this class:

Patent Number Title Of Patent Date Issued
7021939 System and method for determining area of irregular or complex shapes Apr. 4, 2006
6739875 Teach-aiding weight set May. 25, 2004
6390821 Engineered protein kinases which can utilize modified nucleotide triphosphate substrates May. 21, 2002
6200140 Double-beam math balance Mar. 13, 2001
5951406 Adjustable see-saw apparatus Sep. 14, 1999
5927989 Four-pan algebra balance having an imbalance correction mechanism Jul. 27, 1999
5425643 Mechanical, analog type, teaching aid computer Jun. 20, 1995
4871314 Toy balance concept-developing device Oct. 3, 1989
4733887 Secure financial document Mar. 29, 1988
4731022 Teaching arithmetic principles Mar. 15, 1988
4240213 Educational amusement device for matching words with non-verbal symbols Dec. 23, 1980
4218835 Animal scale toy Aug. 26, 1980
4106220 Mathematical teaching aid Aug. 15, 1978
3949491 Mathematical teaching aid Apr. 13, 1976

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