Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Business
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











 
 
  Recently Added Patents
Methods for predicting cardiac toxicity
Creating and manufacturing documents that initially exceed equipment finishing capacity
Signal apparatus for facilitating safe backup of vehicles
Dimmable LED light fixture having adjustable color temperature
Method of measuring the flux of a soil gas
Method of and apparatus for evaluating an optimal irradiation amount of an electron beam for drawing a pattern onto a sample
Method and receiver for jointly decoding received communication signals using maximum likelihood detection
  Randomly Featured Patents
Determining an international destination address
Vehicle diagnostic device housing assembly and method positioned and retained in vehicle cup holder
Machine for joining separate products into a sandwich
Following distance control device and following distance control method
Constant-flow irrigation tape and method of making
Method and system to inhibit a function of a nerve traveling with an artery
SRAM-type memory cell
Semiconductor device operating in high frequency range
Testing system for simulating human faculties in the operation of video equipment
Enhancing the intelligibility of received speech in a noisy environment