Patent US3793469A successfully refreshed from Google Patents.
US3793469A
Expired / Lapsed
US
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Graphic answer input device for a teaching machine
Assignee: Individual
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Filing: 1972-12-22
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Granted: 1974-02-19
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Expires: 1992-12-22
Abstract
Abstract A graphic answer input device for a teaching machine comprising successively superimposed parts: a contact-bearing board every contact of which is connected to the logical unit of the teaching machine via two diodes individually connected in the forward direction; a punched card; a current-carrying plate and a problem blank on which the student drafts the required drawing. In the design the diodes belonging to the contacts forming one row are interconnected and form one line, while other diodes belonging to the same contacts of the same row are also interconnected and form another line.
Inventors
- 👤 G Akimtsev
- 👤 I Tarnopolsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:58
CPC Classifications
G; G09; G09B; G09B23/00; G09B23/02; G09B23/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A graphic answer input device for a teaching machine having a logic unit and comprising: a contact bearing board having a plurality of contacts arranged in rows thereon and electrically connected to said logic unit; means disposed on said contact board for transmitting electric pulses to definite contacts of said plurality of contacts corresponding to a correct successive stage being drawn by a pupil on a problem blank of said graphic input device, each of said plurality of contacts being connected to said logic unit via two diodes connected separately in a conductive direction, one of said two diodes belonging to each contact forming a row being connected to one another to form one line, while the other of said two diodes belonging to the same contacts of the same row being connected to one another to form another line.
Claim 2
Dependent Claim
140 words
A graphic answer input device for a teaching machine having a logic unit and comprising: a contact bearing board having a plurality of contacts arranged in rows thereon and electrically connected to said logic unit; means disposed on said contact board for transmitting electric pulses to definite contacts of said plurality of contacts corresponding to a correct successive stage being drawn by a pupil on a problem blank of said graphic input device, each of said plurality of contacts being connected to said logic unit via two diodes connected separately in a conductive direction, one of said two diodes belonging to each contact forming a row being connected to one another to form one line, while the other of said two diodes belonging to the same contacts of the same row being connected to one another to form another line.
References Cited (Backward Citations)
US3106027A
Cited
US3522664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |