Patent US3336682A successfully refreshed from Google Patents.
US3336682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational chalk board
Assignee: Child Guidance Toys Inc
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Filing: 1965-04-21
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Granted: 1967-08-22
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Expires: 1985-04-21
Abstract
No abstract record available.
Inventors
- 👤 Robert I Genin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:09
CPC Classifications
B; B43; B43L; B43L1/00; B43L1/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A CHALK BOARD STRUCTURE COMPRISING (A) A WRITING BOARD, (B) A RECTANGULAR FRAME FOR SAID BOARD, SAID FRAME HAVING A CORRUGATED CONFIGURATION DEFINING AN EXTENDED BORDER AND YIELDABLE WALLS FORMING PARALLEL CHANNELS, SAID BORDER ENCOMPASSING SAID BOARD WHEREBY SAID CHANNELS LIE THEREOVER, AND (C) AT LEAST ONE SNAP-IN ELEMENT USEFUL IN CONJUNCTION WITH SAID BOARD AND PROVIDED WITH REAR PROJECTIONS INSERTABLE IN SAID CHANNELS AND GRIPPED BY SAID YIELDABLE WALLS TO HOLD SAID ELEMENT TO SAID FRAME.
Claim 2
Dependent Claim
77 words
A CHALK BOARD STRUCTURE COMPRISING (A) A WRITING BOARD, (B) A RECTANGULAR FRAME FOR SAID BOARD, SAID FRAME HAVING A CORRUGATED CONFIGURATION DEFINING AN EXTENDED BORDER AND YIELDABLE WALLS FORMING PARALLEL CHANNELS, SAID BORDER ENCOMPASSING SAID BOARD WHEREBY SAID CHANNELS LIE THEREOVER, AND (C) AT LEAST ONE SNAP-IN ELEMENT USEFUL IN CONJUNCTION WITH SAID BOARD AND PROVIDED WITH REAR PROJECTIONS INSERTABLE IN SAID CHANNELS AND GRIPPED BY SAID YIELDABLE WALLS TO HOLD SAID ELEMENT TO SAID FRAME.
References Cited (Backward Citations)
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Cited
US2092323A
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US2643466A
Cited
US3107442A
Cited
US3110917A
Cited
FR1368905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |