Resources Contact Us Home
Browse by Category: Main > Business
Class Information
Number: 434/192
Name: Education and demonstration > Mathematics > Arithmetic > Chalkboard or equivalent means having readily erasable surface
Description: Subject matter including a panel having a surface from which marks made by chalk or other means can easily be erased.

Patents under this class:

Patent Number Title Of Patent Date Issued
5769639 Multi-educational device Jun. 23, 1998
5725380 Combination writing board and abacus Mar. 10, 1998
4772208 Apparatus for use in teaching mathematics Sep. 20, 1988
4763291 Remote display device for a microcomputer Aug. 9, 1988
4313727 Educational frame device having a rotatable body and rotatable symbol-bearing inserts Feb. 2, 1982

  Recently Added Patents
Formwork release composition and use thereof
Push-up bar
Quick mounting device
System for collecting computer application usage data of targeted application programs executed on a plurality of client devices
Communicating channel state information using predictive vector quantization
Weight-balanced polygonal mirror, light scanning unit using the polygonal mirror, and image forming apparatus
Field emission cathode structure
  Randomly Featured Patents
Plant for cooling heated goods
Bobbin winder for a spinning wheel
Forming an electrowetting module having a hydrophilic grid
Catch device with automatic clearance compensation, in particular for vehicle door locks
Porous carbonaceous material
Graphical interface system for manipulating a virtual dummy
Hollow charge
Coarse and fine electronic ramp function generator
Hybrid energy storage system
One dimensional beam blanker array