Patent US2245972A successfully refreshed from Google Patents.
Patent US4138116A successfully refreshed from Google Patents.
US4138116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Puzzle assembly
Assignee: Individual
•
Filing: 1977-11-08
•
Granted: 1979-02-06
•
Expires: 1997-11-08
Abstract
Abstract A puzzle solved as a perfect square consisting of sixteen congruent, isosceles right triangles, 8 of which have their rignt-angle apices rounded, the remaining 8 having both of their acute angled corners rounded. The task is to solve the puzzle so that the periphery of the square is uninterrupted by any round corners.
Inventors
- 👤 Worthy G. Siders, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:18
CPC Classifications
A; A63; A63F; A63F9/00; A63F9/06; A63F9/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
56 words
A puzzle assembly solved as a planar square consisting of sixteen congruent isosceles right triangular pieces, each of said pieces having a predetermined number of corners which are rounded in a predetermined, patterned manner with the remaining corners being sharp whereby the solved puzzle is a square having perfectly smooth, uninterrupted side edges and sharp corners.
Claim 2
Dependent Claim
56 words
A puzzle assembly solved as a planar square consisting of sixteen congruent isosceles right triangular pieces, each of said pieces having a predetermined number of corners which are rounded in a predetermined, patterned manner with the remaining corners being sharp whereby the solved puzzle is a square having perfectly smooth, uninterrupted side edges and sharp corners.
Claim 3
Dependent Claim
36 words
The puzzle assembly claimed in claim 1, wherein the right-angle corners of half of said triangular pieces are rounded and the acute angled corners of each of the remaining half of said triangular pieces are rounded.
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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |