Patent US4258920A successfully refreshed from Google Patents.
US4258920A
Expired / Lapsed
US
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Magnetic jigsaw puzzle
Assignee: Individual
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Filing: 1978-07-31
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Granted: 1981-03-31
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Expires: 1998-07-31
Abstract
Abstract A magnetic jigsaw puzzle wherein either the playing board or the play pieces are magnetized and the other is metallic. The method of making magnetized pieces or board comprises mixing iron filings, shredded paper and water with a rust inhibitor in the form of a zinc salt to form a slurry, rolling the slurry, drying the wet mass; printing on the dried sheet; die cutting and packaging.
Inventors
- 👤 Don C. Waldron
- 👤 Phanoy Waldron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:18
CPC Classifications
A; A63; A63F; A63F9/00; A63F9/06; A63F9/10; A63F2009/1016; A63F2009/1022; A63F2009/1033; A63F9/1044; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
A jigsaw puzzle comprising a board having a playing surface and a set of a plurality of interfitting play pieces, with one of the two of said board and said set of pieces each being of magnetized material and with the other being formed of a metallic material that detachably adheres to a magnetized material, in which the magnetized material is formed of a sheet material comprised of a dried water slurry of mixed shredded paper, and magnetic particles which slurry has been rolled into a sheet and with the magnetic particles being formed of magnetic iron filings, in which a rust inhibitor in the form of a zinc salt has been added to the slurry.
Claim 2
Dependent Claim
116 words
A jigsaw puzzle comprising a board having a playing surface and a set of a plurality of interfitting play pieces, with one of the two of said board and said set of pieces each being of magnetized material and with the other being formed of a metallic material that detachably adheres to a magnetized material, in which the magnetized material is formed of a sheet material comprised of a dried water slurry of mixed shredded paper, and magnetic particles which slurry has been rolled into a sheet and with the magnetic particles being formed of magnetic iron filings, in which a rust inhibitor in the form of a zinc salt has been added to the slurry.
Claim 3
Dependent Claim
15 words
The combination as recited in claim 1 in which the rust inhibitor is zinc dithiophosphate.
References Cited (Backward Citations)
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Cited
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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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |