Patent EP0373405A2 successfully refreshed from Google Patents.
US3943643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatically cleared toy slate
Assignee: Scott Fisher Development Co
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Filing: 1974-03-18
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Granted: 1976-03-16
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Expires: 1994-03-18
Abstract
Abstract A toy slate of the type that has a wax coated dark slate board, a flexible milky translucent film over the slate board and a relatively impression proof transparent plastic cover layer is provided with a means for forcing a blast of air between the wax covered slate board and the translucent plastic layer thereabove to separate such layer from the slate board and clear the toy slate.
Inventors
- 👤 John B. Fisher
- 👤 Donald W. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:07
CPC Classifications
B; B43; B43L; B43L1/00; B43L1/12; B43L1/123; B43L1/126
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
A toy slate comprising a laminated slate means including a slate board, and a transparent plastic cover sheet having a translucent milky layer thereunder; and a bellows means operatively connected to the slate means between the slate board and the adjacent layer so that a sudden compressive force applied to the bellows means forces a blast of air to flow between the slate board and the layer to separate the layer from the slate board and erase any marking appearing on the slate means.
Claim 2
Dependent Claim
84 words
A toy slate comprising a laminated slate means including a slate board, and a transparent plastic cover sheet having a translucent milky layer thereunder; and a bellows means operatively connected to the slate means between the slate board and the adjacent layer so that a sudden compressive force applied to the bellows means forces a blast of air to flow between the slate board and the layer to separate the layer from the slate board and erase any marking appearing on the slate means.
Claim 3
Dependent Claim
33 words
A toy slate as in claim 1 where the bellows means comprise a resilient block member and a flexible bag receiving the block and having an exhaust opening connecting to the slate means.
Claim 4
Dependent Claim
49 words
A toy slate article as in claim 1 where the bellows means comprise a carrier board that includes front and back layers, and a spring means positioned between such front and back layers to urge them apart, the slate means and the carrier board forming an air tight enclosure.
Claim 5
Dependent Claim
20 words
A toy slate article as in claim 1 wherein the bellows means comprise a resilient member and an enclosure therefor.
Claim 6
Dependent Claim
26 words
A toy slate as in claim 1 where the bellows means comprise a bellows, and an exhaust tube for the bellows connected to the slate means.
Claim 7
Dependent Claim
32 words
A toy slate article as in claim 1 where a carrier board is provided and includes front and back layers, and the bellows means is positioned between such front and back layers.
Claim 8
Dependent Claim
44 words
A toy slate as in claim 1 where a carrier board including front and back layers is provided, said bellows means is positioned between said front and back layers, and one of said layers has an air supply aperture therethrough adjacent said bellows means.
Claim 9
Dependent Claim
50 words
A toy slate as in claim 7 where said slate means includes a flexible milky colored sheet between said plastic cover sheet and said slate board, said milky colored sheet forming said milky layer, and any air blast provided flows between said slate board and said flexible milky colored sheet.
Claim 10
Dependent Claim
98 words
A toy slate comprising a carrier board; a slate means including a wax coated paper slate board, a translucent flexible plastic film layer extending over the slate board, and a transparent relatively hard plastic cover sheet covering the plastic film layer secured to the carrier board; a porous resilient foam block; and a flexible bag receiving the foam block therein, the bag including a mouth opening, which bag is secured to the slate means and extends a short distance thereinto from one margin thereof with the mouth opening being between the slate board and the adjacent film layer.
Claim 11
Dependent Claim
98 words
A toy slate comprising a carrier board; a slate means including a wax coated paper slate board, a translucent flexible plastic film layer extending over the slate board, and a transparent relatively hard plastic cover sheet covering the plastic film layer secured to the carrier board; a porous resilient foam block; and a flexible bag receiving the foam block therein, the bag including a mouth opening, which bag is secured to the slate means and extends a short distance thereinto from one margin thereof with the mouth opening being between the slate board and the adjacent film layer.
Claim 12
Dependent Claim
70 words
A toy slate as in claim 9 and including means sealing the margins of the slate board and plastic film layer opposite the bag together whereby a sudden compressive force applied to the foam block forces a blast of air from the bag to flow between the slate board and the plastic film to separate the film from the slate board and erase any marking appearing on the plastic film.
References Cited (Backward Citations)
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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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |