Patent US4452588A successfully refreshed from Google Patents.
US4452588A
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Mathematical game apparatus
Assignee: Individual
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Filing: 1983-06-16
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Granted: 1984-06-05
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Expires: 2003-06-16
Abstract
Abstract An apparatus for generating arithmetic expressions is disclosed. It comprises sets of number dice and of operator dice. The number dice are provided in two different colors, in order to remove ambiguity arising from the non-cumulative operations of subtraction and division, and to provide a means of designating negative numbers if so desired.
Inventors
- 👤 William O. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:53
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02; A; A63; A63F; A63F9/00; A63F9/04; A63F9/0413; A63F3/00; A63F3/04; A63F3/0415
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
211 words
Instructional apparatus comprising, in combination a first die, associated with and bearing a first color and a first set of six numbers, said first die bearing exactly one of each of said first set of numbers upon each of its six faces; a second die, associated with the bearing a second color and bearing exactly one of each of said first set of numbers upon each of its six faces; a third die, associated with and bearing said first color and a second set of six numbers, and bearing exactly one of each of said second set of numbers upon each of its six faces; a fourth die, associated with and bearing said second color and bearing exactly one of said second set of numbers upon each of its six faces; a fifth die, bearing upon five of its six faces symbols representing addition, subtraction, multiplication, division and zero, and having a face blank; a sixth die, bearing upon two faces a symbol representing addition and bearing upon two other facaes a symbol representing subtraction and having the remaining two faces blank; and a seventh die, bearing upon two faces a symbol representing multiplication and bearing upon two other faces a symbol representing division and having the remaining two faces blank.
Claim 2
Dependent Claim
211 words
Instructional apparatus comprising, in combination a first die, associated with and bearing a first color and a first set of six numbers, said first die bearing exactly one of each of said first set of numbers upon each of its six faces; a second die, associated with the bearing a second color and bearing exactly one of each of said first set of numbers upon each of its six faces; a third die, associated with and bearing said first color and a second set of six numbers, and bearing exactly one of each of said second set of numbers upon each of its six faces; a fourth die, associated with and bearing said second color and bearing exactly one of said second set of numbers upon each of its six faces; a fifth die, bearing upon five of its six faces symbols representing addition, subtraction, multiplication, division and zero, and having a face blank; a sixth die, bearing upon two faces a symbol representing addition and bearing upon two other facaes a symbol representing subtraction and having the remaining two faces blank; and a seventh die, bearing upon two faces a symbol representing multiplication and bearing upon two other faces a symbol representing division and having the remaining two faces blank.
Claim 3
Dependent Claim
29 words
The apparatus of claim 1, and in which each number in said first set of six numbers is less than each number in said second set of six numbers.
Claim 4
Dependent Claim
34 words
The apparatus of claim 2, and in which said first set of six numbers consists of the numbers 1,2,3,4, 5,6 and in which said second set of six numbers consists of the numbers 7,8,9,10,11,12.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |