US3811682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding puzzle
Assignee: Berkeley Applied Research Corp
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Filing: 1972-06-01
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Granted: 1974-05-21
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Expires: 1992-06-01
Abstract
Abstract An interlocking folding puzzle is formed from an elongated rectangular web having a plurality of triangular stiffening panels arranged thereon in spaced apart sets of four to form four repeating spaced apart edge aligned squares. Each of the squares is folded along one of its diagonals and the ends of the web are connected together such that each square forms one quarter of a composite interfolded square. Those portions of the web between the stiffening panels constitute hinges which enable the stiffening panels to assume various relationships relative to each other. The web is formed of polyethylene, polypropylene or polyvinylchloride to provide long life, non-memory hinges.
Inventors
- 👤 R Neale
- 👤 P Wilhelmsen
- 👤 D Winterhalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:35
CPC Classifications
A; A63; A63F; A63F9/00; A63F9/06; A63F9/08; A63F9/088; Y; Y10; Y10S; Y10S273/00; Y10S273/04; Y10S273/05; Y10S273/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
The puzzle defined in claim 1 wherein the elastomer is a plastic selected from the group consisting of polyethylene, polypropylene and polyvinylchloride.
Claim 2
Dependent Claim
16 words
The puzzle defined in claim 1 wherein the stiffening panels are formed integrally with the web.
Claim 3
Dependent Claim
27 words
The puzzle defined in claim 1 wherein said stiffening panels have at least two different indicia thereon distinguishing some of said panels from other of said panels.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |