US3382588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Response expression apparatus for teaching machines
Assignee: Educational Testing Service
•
Filing: 1965-01-11
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Granted: 1968-05-14
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Expires: 1985-01-11
Abstract
No abstract record available.
Inventors
- 👤 Serrell Robert
- 👤 Frederick R Kling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:03
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
APPARATUS FOR INDICATING THE RESPONSE OF AN OBSERVER TO AN INTELLIGIBLE VISUAL REPRESENTATION A PART OF WHICH IS TO BE IDENTIFIED INCLUDING IN COMBINATION, A SCREEN HAVING A VIEWING SURFACE, MEANS FOR PROJECTING A VISIBLE IMAGE OF SAID REPRESENTATION THROUGH SAID SCREEN TO THE VIEWING SURFACE THEREOF FROM A SIDE THEREON REMOTE SAID VIEWING SURFACE, A PLURALITY OF LIGHT TRANSMITTING PROXIMITY RESPONSIVE DEVICES ADAPTED TO BE ACTUATED BY SAID OBSERVER, AND MEANS MOUNTING SAID DEVICES ADJACENT THE REMOTE SIDE OF SAID SCREEN AT LOCATIONS REGISTERING WITH DISCRETE RESPECTIVE AREAS OF SAID IMAGE IN THE FIELD OF VIEW OF SAID
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) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |