Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Business
Class Information
Number: 434/204
Name: Education and demonstration > Mathematics > Arithmetic > Apertured elements threaded on elongate means (e.g., abacus, etc.) > Elements manually placed on or removed from elongate means during use
Description: Subject matter wherein the apertured pieces are placed by hand on the wire, rod, or like means during instruction of a student.










Patents under this class:

Patent Number Title Of Patent Date Issued
8437688 Test and answer key generation system and method May. 7, 2013
7914287 System and method of teaching and learning mathematics Mar. 29, 2011
7309233 System and method of teaching and learning mathematics Dec. 18, 2007
6575754 Device and method for teaching mathematical properties associated with even and odd numbers Jun. 10, 2003
5788556 Illuminated stacked bead art toy Aug. 4, 1998
5525089 Rotatable, demountable blocks of several shapes on a central elastic anchor Jun. 11, 1996
5395245 Elastic pattern abacus and tool for changing arrangement of abacus beads Mar. 7, 1995
5302148 Rotatable demountable blocks of several shapes on a central elastic anchor Apr. 12, 1994
5176521 Educational apparatus with interchangeable task assigning template Jan. 5, 1993
4629431 Game for teaching time concepts Dec. 16, 1986











 
 
  Recently Added Patents
Plants and seeds of corn variety CV577261
Telephone relaying apparatus, telephone relaying method, and program
Process and intermediates for preparing lapatinib
Mobile device case with storage compartment
Means to securely fixate pacing leads and/or sensors in vessels
Method and system for providing complete internet anywhere with partial server processing
Method and device for determining processed image data about a surround field of a vehicle
  Randomly Featured Patents
Lipopeptide compositions
Piezoelectric/electrostrictive element having a specific coverage area of electrode on substrate, and manufacturing method of the same
Consistency check in device design and manufacturing
Depilating composition and method
Method and apparatus for analysis of chromatographic migration patterns
Electronically controlled hydraulic brake boost pressure control system
Process for the stabilization of proteins in complex mixtures during their storage in aqueous solvents
Calibration of optical line shortening measurements
Herbicide tolerant rice plants and methods for identifying same
Thread storage and delivery device with adjustable bristle alignment