Patent US2741757A successfully refreshed from Google Patents.
Patent US2364942A successfully refreshed from Google Patents.
Patent US2302605A successfully refreshed from Google Patents.
Patent US3382588A successfully refreshed from Google Patents.
US3382588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Response expression apparatus for teaching machines
Assignee: Educational Testing Service
•
Filing: 1965-01-11
•
Granted: 1968-05-14
•
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 15:10
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)
US2188973A
Cited
US2435880A
Cited
US2695402A
Cited
US2659533A
Cited
US2782406A
Cited
US2975345A
Cited
US3056907A
Cited
US3095653A
Cited
US3233341A
Cited
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 |