Patent US4836548A successfully refreshed from Google Patents.
US4836548A
Expired / Lapsed
US
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Escape mechanism for sliding block puzzles
Assignee: Individual
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Filing: 1987-08-21
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Granted: 1989-06-06
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Expires: 2007-08-21
Abstract
Abstract A mechanism for easy removal of the sliding blocks from a sliding block puzzle of tongue and groove design, allowing the user to remove and rearrange the blocks to start over.
Inventors
- 👤 Duane R. Chittenden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:11
CPC Classifications
A; A63; A63F; A63F9/00; A63F9/06; A63F9/08; A63F9/0803; A63F9/0807
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
In a sliding block puzzle comprising a game which includes a plurality of frame members and a plurality of blocks slidable within the frame, the blocks mating with each other and the frame by means of tongues and grooves disposed in complementary relationship on adjoining ones of said blocks and by grooves in the inwardly facing walls of selected ones of said frame members and by tongues on the inwardly facing walls of the remaining ones of said frame members, said tongues and grooves cooperating to retain the blocks within the frame, wherein the improvement comprises the modification of the tongue along a section of one of said remaining frame members and the modification of the groove of one of the blocks, the modifications being such that when said one block is positioned adjacent said frame member section the block can be removed from the frame.
Claim 2
Dependent Claim
146 words
In a sliding block puzzle comprising a game which includes a plurality of frame members and a plurality of blocks slidable within the frame, the blocks mating with each other and the frame by means of tongues and grooves disposed in complementary relationship on adjoining ones of said blocks and by grooves in the inwardly facing walls of selected ones of said frame members and by tongues on the inwardly facing walls of the remaining ones of said frame members, said tongues and grooves cooperating to retain the blocks within the frame, wherein the improvement comprises the modification of the tongue along a section of one of said remaining frame members and the modification of the groove of one of the blocks, the modifications being such that when said one block is positioned adjacent said frame member section the block can be removed from the frame.
Claim 3
Dependent Claim
134 words
In a sliding block puzzle as defined in claim 1, wherein said modifications comprise the elimination of the bottom flange along a portion of said groove of said one block and the elimination of the tongue on said frame member section, said eliminated bottom flange and tongue being so related to each other that when said one block is positioned so that said portion of said block along which the bottom flange is eliminated is in juxtaposition to a portion of said one frame member in which the tongue has not been eliminated and a portion of said one block in which the lower flange has not been eliminated is in juxtaposition to the section of said frame member along which the tongue is eliminated said one block can be removed from said frame.
References Cited (Backward Citations)
US4422641A
Cited
US4441715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |