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:
Dec. 13, 1988
Filed:
Oct. 15, 1987
Fumitaka Takahashi, Shizuoka, JP;
Kawai Gakki Seisakusho Co, Ltd, Shizuoka, JP;
Abstract
An instrument for practicing multiplication to be used by children, in which there is a base plate, a printed plate fixed on the base plate, a group of horizontal cursors slidably installed on the base plate, a group of vertical cursors placed on top of the horizontal cursors and slidably installed on the base plate, and a top cover grass plate. These element are arranged as to calculate multiplication by sliding some of these two group of the cursors. One group of the cursors are given a sequence of numbers 1 to 9, and the other group of cursors are given the same sequence of numbers 1 to 9. When a number (X) of one group of cursors and a number (Y) of the other group of cursors are slided to one direction, a figure corresponding to the answer of X by Y and a group of marks equal to the answer are displayed on the instrument.