US3280483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teaching aid and instant self-correcting response device
Assignee: Individual
•
Filing: 1966-02-21
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Granted: 1966-10-25
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Expires: 1986-02-21
Abstract
No abstract record available.
Inventors
- 👤 Alvan F Davenport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:09
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/06; G09B3/08; G09B3/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A MULTIPLE CHOICE RESPONSE INDICATING AND INSTANT SELF CORRECTING DEVICE COMPRISING: A FIRST PAPER SHEET INCLUDING ON ITS TOP FACE SURFACE A PLURALITY OF SETS OF MARKING STATIONS, EACH SET OF STATIONS HAVING INDICIA MARKS REPRESENTING POSSIBLE RESPONSES TO ONE OF A PLURALITY OF MULTIPLE CHOICE TEST QUESTIONS; A SECOND PAPER SHEET CONNECTED TO AND UNDERLYING SAID FIRST SHEET AND INCLUDING ON ITS TOP FACE SURFACE A PLURALITY OF STATIONS AND INDICIA MARKS CORRESPONDING AND REGISTERING WITH SAID FIRST NAMED STATIONS AND INDICIA MARKS; PRESSURE SENSITIVE COLOR REPRODUCING MEANS ON THE UNDERSIDE OF SAID FIRST PAPER SHEET IN REGISTRY WITH THE MARKING STATIONS REPRESENTATIVE OF CORRECT RESPONSES; NON-REPRODUCING MEANS ON THE UNDERSIDE OF SAID FIRST PAPER SHEET IN REGISTRY WITH THE MARKING STATIONS REPRESENTING INCORRECT RESPONSES; AND SAID REPRODUCING AND NON-REPRODUCING MEANS BEING SUBSTANTIALLY VISUALLY INDISTINGUISHABLE.
Claim 2
Dependent Claim
136 words
A MULTIPLE CHOICE RESPONSE INDICATING AND INSTANT SELF CORRECTING DEVICE COMPRISING: A FIRST PAPER SHEET INCLUDING ON ITS TOP FACE SURFACE A PLURALITY OF SETS OF MARKING STATIONS, EACH SET OF STATIONS HAVING INDICIA MARKS REPRESENTING POSSIBLE RESPONSES TO ONE OF A PLURALITY OF MULTIPLE CHOICE TEST QUESTIONS; A SECOND PAPER SHEET CONNECTED TO AND UNDERLYING SAID FIRST SHEET AND INCLUDING ON ITS TOP FACE SURFACE A PLURALITY OF STATIONS AND INDICIA MARKS CORRESPONDING AND REGISTERING WITH SAID FIRST NAMED STATIONS AND INDICIA MARKS; PRESSURE SENSITIVE COLOR REPRODUCING MEANS ON THE UNDERSIDE OF SAID FIRST PAPER SHEET IN REGISTRY WITH THE MARKING STATIONS REPRESENTATIVE OF CORRECT RESPONSES; NON-REPRODUCING MEANS ON THE UNDERSIDE OF SAID FIRST PAPER SHEET IN REGISTRY WITH THE MARKING STATIONS REPRESENTING INCORRECT RESPONSES; AND SAID REPRODUCING AND NON-REPRODUCING MEANS BEING SUBSTANTIALLY VISUALLY INDISTINGUISHABLE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |