Patent US4258477A successfully refreshed from Google Patents.
US4258477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplication study device
Assignee: Gakken Holdings Co Ltd
•
Filing: 1979-11-28
•
Granted: 1981-03-31
•
Expires: 1999-11-28
Abstract
Abstract A multiplication study device for teaching a student multiplication skills by operation of push-buttons mounted in a box-shaped case. The push-buttons are each provided with a semi-transparent see-through surface which permits the appearance therethrough of an answer to a multiplication problem when the push-button is depressed so as to come into contact with a projecting member disposed therebelow. A plurality of the push-buttons are mounted in the case, and the case includes a rear cover for mounting the projecting members. A common resilient member in the form of a urethane plate is employed for normally urging the push-buttons in an upward direction.
Inventors
- 👤 Shozo Ishiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:44
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/02; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
177 words
A multiplication study device, comprising: a case provided with a plurality of holes penetrating therethrough; a plurality of substantially hollow push-buttons having opened rear sides, each said push-button being adapted to move up and down through a respective one of said holes; each said push-button having at least a part of the upper surface thereof formed as a substantially semi-transparent see-through surface; a plurality of projecting members respectively disposed on the rear side of respective ones of said push-buttons for slidably supporting and guiding said push-buttons; each said projecting member having a multiplication answer marked on that portion of the top surface thereof which faces said see-through surface of said push-buttons; a resilient member for urging said push-buttons to move upwardly along said projecting members; and whereby pressing down of said push-button against the force of said resilient member causes the upper surface of said push-button to approach and contact the top of said projecting member such that said multiplication answer marked on the top of said projecting member appears through said see-through surface of said push-button.
Claim 2
Dependent Claim
177 words
A multiplication study device, comprising: a case provided with a plurality of holes penetrating therethrough; a plurality of substantially hollow push-buttons having opened rear sides, each said push-button being adapted to move up and down through a respective one of said holes; each said push-button having at least a part of the upper surface thereof formed as a substantially semi-transparent see-through surface; a plurality of projecting members respectively disposed on the rear side of respective ones of said push-buttons for slidably supporting and guiding said push-buttons; each said projecting member having a multiplication answer marked on that portion of the top surface thereof which faces said see-through surface of said push-buttons; a resilient member for urging said push-buttons to move upwardly along said projecting members; and whereby pressing down of said push-button against the force of said resilient member causes the upper surface of said push-button to approach and contact the top of said projecting member such that said multiplication answer marked on the top of said projecting member appears through said see-through surface of said push-button.
Claim 3
Dependent Claim
29 words
A multiplication study device according to claim 1, wherein: said device includes eighty-one of said holes in said case, eighty-one of said push-buttons, and eighty-one of said projecting members.
Claim 4
Dependent Claim
58 words
A multiplication study device according to claim 2, wherein: said case is formed into a box having an open rear side; a rear member is fitted to said case so as to cover said open rear side thereof; and said eighty-one projecting members are formed integrally with said rear member and project toward the surface of said case.
Claim 5
Dependent Claim
84 words
A multiplication study device according to claim 3, wherein: said resilient member comprises a urethane plate of substantially constant thickness; said urethane plate is provided with eighty-one holes formed therethrough at locations corresponding to the locations of said eighty-one projecting members so as to receive said projecting members; and said urethane plate is affixed to the surface of said rear member having projecting members integrally formed therewith such that the lower ends of each said push-button contacts the upper surface of said urethane plate.
Claim 6
Dependent Claim
46 words
A multiplication study device according to claim 1 or 2, wherein: each said push-button has said see-through surface provided at one portion of the upper surface thereof, with the remaining portion of the upper surface thereof having a multiplication problem corresponding to said answer marked thereon.
Claim 7
Dependent Claim
24 words
A multiplication study device according to claim 1, wherein: a multiplication problem is marked on the surface of said case for each said push-button.
References Cited (Backward Citations)
US1673659A
Cited
US3572719A
Cited
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 |