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Patent US3280481A successfully refreshed from Google Patents.
US3280481A
Expired / Lapsed
US
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Student workbook having one or more pages comprising separably joined cards
Assignee: Bell and Howell Co
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Filing: 1964-05-13
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Granted: 1966-10-25
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Expires: 1984-05-13
Abstract
No abstract record available.
Inventors
- 👤 Frank D Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:31
CPC Classifications
B; B42; B42F; B42F5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A TWO-PAGE SPREAD SHEET OF TEACHING CARDS COMPRISING ALIGNED SETS OF CARDS ENTIRELY SEPARATED FROM ONE ANOTHER EXCEPT AT SMALL INTEGRAL BREAK-AWAY CONNECTING AREAS, A VERTICAL CONNECTOR STRIP SEPARATING THE CARDS OF THE RESEPCTIVE PAGES AND BEING FOLDABLE ALONG A VERTICAL LINE FOR FOLDING OF THE PAGES OF THE SHEET, AND HORIZONTALLY EXTENDING MAGNETIC RECORDING TRACK STRIPES ON THE FOLDABLY OPPOSING FACES OF THE CARDS, SAID STRIPES BEING RELATIVELY OFFSET ON SAID OPPOSING FACES SO AS TO AVOID CONTACT WITH ONE ANOTHER WHEREBY TO AVOID DETERIORATION OF RECORDINGS ON THE TRACK STRIPES WHEN SAID FACES ARE FOLDED TOGETHER.
Claim 2
Dependent Claim
98 words
A TWO-PAGE SPREAD SHEET OF TEACHING CARDS COMPRISING ALIGNED SETS OF CARDS ENTIRELY SEPARATED FROM ONE ANOTHER EXCEPT AT SMALL INTEGRAL BREAK-AWAY CONNECTING AREAS, A VERTICAL CONNECTOR STRIP SEPARATING THE CARDS OF THE RESEPCTIVE PAGES AND BEING FOLDABLE ALONG A VERTICAL LINE FOR FOLDING OF THE PAGES OF THE SHEET, AND HORIZONTALLY EXTENDING MAGNETIC RECORDING TRACK STRIPES ON THE FOLDABLY OPPOSING FACES OF THE CARDS, SAID STRIPES BEING RELATIVELY OFFSET ON SAID OPPOSING FACES SO AS TO AVOID CONTACT WITH ONE ANOTHER WHEREBY TO AVOID DETERIORATION OF RECORDINGS ON THE TRACK STRIPES WHEN SAID FACES ARE FOLDED TOGETHER.
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 |