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:
Jan. 18, 1977
Filed:
Jul. 11, 1975
Robert Maddestra, Canton, MA (US);
David E Munn, Framingham, MA (US);
Damon Corporation, Needham Heights, MA (US);
Abstract
An educational alphabet block formed of a polymeric material and having the configuration of a cube with a square recess on each face for receiving a removable chip. Each face of the block also defines an aperture. The aperture reduces the weight of the block without reducing its strength and also provides a means for inserting rods into the block. The chip is fabricated of a polymeric material and includes opposed flexible lips about a groove around the perimeter of the chip. The flexible lips facilitate the ease with which chips are inserted and removed from a recess in the face of the block. The groove enables the lip of one chip to be used to remove another chip secured in a recess in the block. The chip may have appropriate legends such as letters of the alphabet, numerals or scenes printed on one or both faces. Alternatively, the chips may define a central aperture for the insertion of rods into the blocks. The chips themselves have a thickness substantially twice the depth of the recess on the face of the block in order that a single chip may be used to fasten opposed faces of two blocks together. The square configuration of the chips prevents the movement of mated faces when secured together.