US3230641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmed instruction devices
Assignee: Sloves Mechanical Binding Co Inc
•
Filing: 1962-02-23
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Granted: 1966-01-25
•
Expires: 1982-02-23
Abstract
No abstract record available.
Inventors
- 👤 Sloves Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:51
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/02; G09B3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROGRAMMED TEACHING BOOK COMPRISING A BOOK HAVING PAPER PAGES REMOVABLY BOUND THEREIN, EACH PAGE HAVING A PRINTED COLUMN OF QUESTIONS AND AN ADJACENTLY PRINTED COLUMN OF ANSWERS, WHEREBY A STUDENT AFTER ANSWERING THE QUESTIONS APPEARING ON THE TOP PAGE OF THE BOOK REMOVES SAME TO EXPOSE THE NEXT UNANSWERED PAGE WHICH THEN BECOMES THE TOP PAGE, A MASKING JACKET CONSTITUTED BY A TRANSPARENT OPEN-ENDED ENVELOPE OVERLYING THE ANSWER COLUMN ON THE TOP PAGE OF THE BOOK, THE UP-
Claim 2
Dependent Claim
79 words
A PROGRAMMED TEACHING BOOK COMPRISING A BOOK HAVING PAPER PAGES REMOVABLY BOUND THEREIN, EACH PAGE HAVING A PRINTED COLUMN OF QUESTIONS AND AN ADJACENTLY PRINTED COLUMN OF ANSWERS, WHEREBY A STUDENT AFTER ANSWERING THE QUESTIONS APPEARING ON THE TOP PAGE OF THE BOOK REMOVES SAME TO EXPOSE THE NEXT UNANSWERED PAGE WHICH THEN BECOMES THE TOP PAGE, A MASKING JACKET CONSTITUTED BY A TRANSPARENT OPEN-ENDED ENVELOPE OVERLYING THE ANSWER COLUMN ON THE TOP PAGE OF THE BOOK, THE UP-
References Cited (Backward Citations)
US1346017A
Cited
US1492932A
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GB332119A
Cited
US2234075A
Cited
US2628435A
Cited
US3054195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |