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US3851409A Expired / Lapsed US ⏱️ 0.0 years remaining

Mathematical educational device

Assignee: Individual
•
Filing: 1974-03-20
•
Granted: 1974-12-03
•
Expires: 1994-03-20
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Abstract

Abstract A mathematical educational device or game is provided comprising at least two playing boards each of which has a triangular cutout the base of which is open and co-extensive with one side edge of the playing board while the apex opposite the base lies within the body of the board. Within the triangular cut-out are nine removable slats or pegs numbered sequentially from ''''1'''' -''''9'''' and these slats or pegs are individually shaped so that, when collectively assembled, they fit within the triangular cut-out diverging from the apex of the cut-out to its base. The middle peg of the group of nine pegs is numbered ''''5'''' and is square cut on both ends while the pegs to either side of it are biased cut at their upper ends so that each peg on one side of mid peg ''''5'''' has a counterpart or mirror-image peg on the other side of the mid peg. To utilize the mathematical device requires the use of at least two boards with the pegs in each board assigned a value, the lowest value being unity and the value assigned to pegs in successive boards being no greater than one multiple of ten. The device not only provides a method for expressing and teaching mathematics, but readily lends itself to teaching various mathematical concepts such as the use of ''''base ten,'''' grouping of numbers, ''''borrowing'''' and ''''carrying'''' for solving problems of subtraction and addition, and the like.

Inventors

  • 👤 T Teahan

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 22:35
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 180 words
A mathematical educational device comprising at least two playing boards, each of said boards having an isoscles triangular cut-out therein with the apex of said triangular cut-out lying within the body of said board and the base thereof open and coextensive with one edge of said board; nine removable pegs for each of said boards, the mid peg thereof being square edged at both ends and each of said remaining pegs being bias cut at one end and square edged at the other end such that when said pegs are assembled in a side-by-side relationship, they collectively fit within and form the same shape as said triangular cut-outs, said pegs being successively numbered from 1 to 9, inclusive, with those pegs bearing numbers 1 to 4 being respectively mirror images of those pegs bearing numbers 6 to 9, inclusive; and, means for assigning a numerical value to the pegs in each of said boards, said value being based on multiples of ten, including unity, and the value assigned to successive playing boards being no greater than one multiple of ten.
Claim 2
Dependent Claim 180 words
A mathematical educational device comprising at least two playing boards, each of said boards having an isoscles triangular cut-out therein with the apex of said triangular cut-out lying within the body of said board and the base thereof open and coextensive with one edge of said board; nine removable pegs for each of said boards, the mid peg thereof being square edged at both ends and each of said remaining pegs being bias cut at one end and square edged at the other end such that when said pegs are assembled in a side-by-side relationship, they collectively fit within and form the same shape as said triangular cut-outs, said pegs being successively numbered from 1 to 9, inclusive, with those pegs bearing numbers 1 to 4 being respectively mirror images of those pegs bearing numbers 6 to 9, inclusive; and, means for assigning a numerical value to the pegs in each of said boards, said value being based on multiples of ten, including unity, and the value assigned to successive playing boards being no greater than one multiple of ten.
Claim 3
Dependent Claim 19 words
The device of claim 1 wherein each pair of said mirror image pegs numerically total a value of ten.
Claim 4
Dependent Claim 28 words
The device of claim 2 wherein said mirror image pegs are geometrically paired in a side-by-side relationship such that the squared edges of said paired pegs are co-extensive.
Claim 5
Dependent Claim 22 words
The device of claim 2 wherein said mirror image pegs are geometrically paired by superimposing one of said pegs on the other.
Claim 6
Dependent Claim 50 words
The device of claim 1 wherein pegs bearing numbers 1 to 5, inclusive, each have squares formed thereon, said squares being equal to the number borne by said pegs; and, pegs bearing numbers 6 to 9, inclusive, have the same number of squares thereon as their respective mirror image pegs.

References Cited (Backward Citations)

FR321251A Cited
US2635355A Cited
US2663096A Cited
US3002295A Cited
US3229388A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-12-02 1978-06-03 1978-12-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-12-02 1982-06-03 1982-12-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-12-02 1986-06-03 1986-12-03 $7700.00 Window Closed / Lapsed

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