Resources Contact Us Home
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
Near-field optical disk having surface plasmon amplification by stimulated emission of radiation
Efficient file system metadata scanning using scoped snapshots
Lateral flow test kit and method for detecting an analyte
Upper surface of a skateboard deck
Double diffused metal oxide semiconductor device and manufacturing method thereof
Method for producing a sulfonated polyarylether block copolymer
Document layout method
  Randomly Featured Patents
Electrically conductive polyolefin blends
Methods and apparatus for signaling to switch between different bus bandwidths
X-band turnstile antenna
One-piece single engagement seal lock
Sun powered electrically operated chime apparatus
Method and device for detecting functional and metabolic data of a living organism
Apparatus for forming gusset pleats in tubular bags
Collapsible footrest
Magnetic slider, head gimbal assembly and method for manufacturing the same
Interrupt modulation method and apparatus