The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 2010
Filed:
Aug. 14, 2006
Gary Buhrman, St. Louis, MO (US);
Gary Buhrman, St. Louis, MO (US);
Other;
Abstract
An educational device is provided which can be used to teach arithmetic. The educational device comprises a track having a scale on an outer surface of said track. The scale is comprised of a plurality of evenly spaced apart unit markings, the markings being spaced apart by a unit length. Blocks are provided which are slidingly received on the track. Each block has a length based on the unit length, and indicium is provided on the each block to identify the length of the block in unit lengths. When a set of blocks is positioned on the track, the end of the last block will line up with a unit marking on the scale representing the overall length of the set of blocks in 'units', and hence showing the sum of the lengths of the set of blocks placed on the track. By adding and removing blocks to the track, addition and subtraction 'facts' can be visually taught.