US4317653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational blocks
Assignee: Individual
•
Filing: 1980-01-21
•
Granted: 1982-03-02
•
Expires: 2000-01-21
Abstract
Abstract Sets of educational blocks are described wherein special volumetric relationships are combined with visually distinctive geometric shapes. In one set of blocks a common cube is cut into distinctive segments along a single slice to form particular polygons. In another set of blocks a common cube is cut in a manner to provide polyhedra of distinctive appearance with related outer segments used to fill out the common cube. Particular volumetric relationships between the polyhedra and their related segments are described.
Inventors
- 👤 Martha S. Wahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:18
CPC Classifications
A; A63; A63F; A63F9/00; A63F9/06; A63F9/12; G; G09; G09B; G09B23/00; G09B23/02; G09B23/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
53 words
A set of educational blocks formed from a common cube and comprising an orthotetrakaidecahedron being the largest which can fit inside said common cube and eight related outer segments which fit in complementary fashion with the orthotetrakaidecahedron to fill out a common cube, said related segments being combinable to form a congruent orthotetrakaidecahedron.
Claim 2
Dependent Claim
53 words
A set of educational blocks formed from a common cube and comprising an orthotetrakaidecahedron being the largest which can fit inside said common cube and eight related outer segments which fit in complementary fashion with the orthotetrakaidecahedron to fill out a common cube, said related segments being combinable to form a congruent orthotetrakaidecahedron.
Claim 3
Dependent Claim
36 words
The set of educational blocks as claimed in claim 1 wherein said related outer segments are congruent and each defines a corner segment of the common cube with one-sixteenth of the volume of the common cube.
References Cited (Backward Citations)
GB429509A
Cited
FR1064191A
Cited
US2843971A
Cited
FR1316018A
Cited
US3659360A
Cited
FR2338064A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-01 | 1985-08-31 | 1986-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-01 | 1989-08-31 | 1990-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-01 | 1993-08-31 | 1994-03-02 | $7700.00 | Window Closed / Lapsed |