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Class Information
Number: 434/187
Name: Education and demonstration > Measurement of length or volume
Description: Subject matter relating to determination of (a) the distance between points, or (b) volume.

Patents under this class:

Patent Number Title Of Patent Date Issued
8684746 Collaborative university placement exam Apr. 1, 2014
8491311 System and method for analysis and feedback of student performance Jul. 23, 2013
8070493 Measurement system apparatus and method of teaching units of measurement Dec. 6, 2011
8021158 Measurement instruction apparatus Sep. 20, 2011
7632099 Measurement system apparatus and method of teaching units of measurement Dec. 15, 2009
D430565 Computer cabinet Sep. 5, 2000
6033282 Multipurpose built-up measuring device Mar. 7, 2000
5366378 Visual teaching aid Nov. 22, 1994
4971560 Teaching aid and method for improving memorization of fundamental facts in the form of equations Nov. 20, 1990
4842521 Visual aid ruler Jun. 27, 1989
4838794 Metric block toy Jun. 13, 1989
4778390 Method and apparatus for teaching fractions Oct. 18, 1988
4721467 Metric system teaching/playing cards Jan. 26, 1988
4152845 Metric conversion board May. 8, 1979
4144657 Teaching aid for mathematics and number systems Mar. 20, 1979
4132348 Slide calculator and method Jan. 2, 1979
4075770 Metric system teaching and measuring device Feb. 28, 1978
4057912 Instrument for facilitating the calculation of equivalent values Nov. 15, 1977
4021923 Metric unit conversion aid May. 10, 1977
3992792 Data conversion apparatus Nov. 23, 1976

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