US4583951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roll-type learning aid apparatus for reading and memorizing
Assignee: FOUNDATION KOREA CAMPUS CRUSADE FOR CHRIST
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Filing: 1985-06-11
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Granted: 1986-04-22
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Expires: 2005-06-11
Abstract
Abstract A roll-type apparatus as a learning aid for reading and memorizing, the apparatus including a case provided with a display window therein, a word-listed paper ribbon wound about a pair of roll-shafts, forward and backward knobs interlocked with the roll-shafts by pinions, and guide rods for maintaining the ribbon under tension and in alignment with the display window during travel between the roll-shafts.
Inventors
- 👤 Choi Y. Soo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:10
CPC Classifications
G; G09; G09B; G09B1/00; G09B1/02; G09B1/16; G09B1/28; B; B42; B42D; B42D19/00; B42D19/005; G09B17/00; G09B19/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A roll-type learning aid apparatus for reading and memorizing English words or Chinese characters etc., comprising a rectangular case consisting of a lid part with a display window and a bottom part with a transverse long-hole formed thereon, a pair of roll-shafts which are rotatably supported over two supporting walls disposed oppositely within said case, a word-listed paper ribbon being wound around both said roll-shafts, a forward knob and a backward knob which are interlocked with the roll-shafts by pinions respectively and partly projected outward the bottom part of case, and two guide rods which serve to maintain the word-listed paper ribbon in parallel with the display window under tension when it travels from one roll-shaft to other roll-shaft.
Claim 2
Dependent Claim
119 words
A roll-type learning aid apparatus for reading and memorizing English words or Chinese characters etc., comprising a rectangular case consisting of a lid part with a display window and a bottom part with a transverse long-hole formed thereon, a pair of roll-shafts which are rotatably supported over two supporting walls disposed oppositely within said case, a word-listed paper ribbon being wound around both said roll-shafts, a forward knob and a backward knob which are interlocked with the roll-shafts by pinions respectively and partly projected outward the bottom part of case, and two guide rods which serve to maintain the word-listed paper ribbon in parallel with the display window under tension when it travels from one roll-shaft to other roll-shaft.
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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |