Patent EP0057129A1 successfully refreshed from Google Patents.
US4239226A
Expired / Lapsed
US
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Random number generator
Assignee: Individual
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Filing: 1978-09-29
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Granted: 1980-12-16
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Expires: 1998-09-29
Abstract
Abstract Random number generators are provided in the form of one or more ten-sided dice, made up of two, identical, regular, five-sided pyramids with planar bases face to face. The faces of each die on opposite sides of the equatorial plane defined by the bases are offset 36° from one another. The equatorial plane is perpendicular to a central axis extending through the apexes of the pyramids and bounded by a circle. The surface of the die immediately contiguous the equatorial plane is formed by a convex surface of revolution of an arc of finite radius, symmetrical with respect to the plane, about the axis.
Inventors
- 👤 E. Frederick Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:24
CPC Classifications
A; A63; A63F; A63F9/00; A63F9/04; A63F9/0415
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A ten-sided die, having a center axis through the apexes of two regular five-sided identical pyramids, each with flat, planar faces and a planar base, joined base to base and rotated 36° with respect to one another, the equatorial plane defined by said bases being perpendicular to said axis, said plane being bounded by a circle with said axis as a center, said circle having a radius no greater than that of a circle tangent to the projection, on an extension of said plane, of the flat faces of said pyramids, the outer surface of said die immediately contiguous the said plane being formed by a convex surface of revolution of an arc of finite radius, symmetrical with respect to the plane, about said axis, whereby the boundary of each face along the said outer surface is arcuate, the dimension of said die along said center axis being no less than the diameter of said circle, and indicia on said faces.
Claim 2
Dependent Claim
161 words
A ten-sided die, having a center axis through the apexes of two regular five-sided identical pyramids, each with flat, planar faces and a planar base, joined base to base and rotated 36° with respect to one another, the equatorial plane defined by said bases being perpendicular to said axis, said plane being bounded by a circle with said axis as a center, said circle having a radius no greater than that of a circle tangent to the projection, on an extension of said plane, of the flat faces of said pyramids, the outer surface of said die immediately contiguous the said plane being formed by a convex surface of revolution of an arc of finite radius, symmetrical with respect to the plane, about said axis, whereby the boundary of each face along the said outer surface is arcuate, the dimension of said die along said center axis being no less than the diameter of said circle, and indicia on said faces.
Claim 3
Dependent Claim
35 words
The die of claim 1 wherein the opposite axial ends of said die are identically and symmetrically rounded, the distance between them being no less than the diameter of the circle bounding the said plane.
Claim 4
Dependent Claim
11 words
The die of claim 1 wherein the said indicia are numbers.
Claim 5
Dependent Claim
36 words
Dice of claim 1 each of a different color whereby numbers displayed on the uppermost face when the dice are at rest in successive rolls may be assembled in the same order by color of die.
Claim 6
Dependent Claim
14 words
The dice of claim 4 wherein three dice are red, white and blue respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |