US3780451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Study device
Assignee: Individual
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Filing: 1972-08-24
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Granted: 1973-12-25
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Expires: 1992-08-24
Abstract
Abstract A query and response study device having a frame member covered by a flexible sheet extending around the frame member with open ends, the sheet being slidable on the frame member, and the sheet having two spaced-apart transverse slots therethrough open to the interior of the frame, the frame accommodating cards having printed indicia thereon in lines. The flexible sheet can slide on the frame to align the slots with a given line on one of the cards held internally of the frame whereby the indicia on that line represents a query. The frame can then be turned over where the other slot will be found to be aligned with a line of printed indicia on the opposite side of the same card or on a different card, that line representing a response to the query.
Inventors
- 👤 W White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:32
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/02; G09B3/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
270 words
A query and response device comprising a flat frame having a hollow interior spAce open at one end and visible from the front and back sides thereof, said hollow interior being sized and shaped to receive in slidable relation therein a stack of cards inserted through the open end thereof, an endless flexible belt trained around said frame covering the front and back of the frame, said belt having windows in the runs thereof overlying the front and back of the frame, said windows being positioned at opposite ends of the respective runs so that when the belt is rotated around the frame, the windows will traverse the front and back sides of the frame in opposite directions, and a set of superimposed cards forming a stack sized to snugly fit the interior of the frame when inserted through the open end of the frame, said cards having query indicia on one face thereof and answer indicia on the opposite face thereof and arranged in sets in said stack so that the top card of the stack will have query indicia exposed in sequence by the window progressing along one run of the belt while the bottom card of the stack will have answer indicia sequentially exposed by the window in the other run of the belt, and the top card in said stack being removable separately through the open end of the frame to expose the next underlying card and being insertable through the end of the frame to cover the bottom card of the stack to provide answers to the query indicia on the newly exposed top card.
Claim 2
Dependent Claim
270 words
A query and response device comprising a flat frame having a hollow interior spAce open at one end and visible from the front and back sides thereof, said hollow interior being sized and shaped to receive in slidable relation therein a stack of cards inserted through the open end thereof, an endless flexible belt trained around said frame covering the front and back of the frame, said belt having windows in the runs thereof overlying the front and back of the frame, said windows being positioned at opposite ends of the respective runs so that when the belt is rotated around the frame, the windows will traverse the front and back sides of the frame in opposite directions, and a set of superimposed cards forming a stack sized to snugly fit the interior of the frame when inserted through the open end of the frame, said cards having query indicia on one face thereof and answer indicia on the opposite face thereof and arranged in sets in said stack so that the top card of the stack will have query indicia exposed in sequence by the window progressing along one run of the belt while the bottom card of the stack will have answer indicia sequentially exposed by the window in the other run of the belt, and the top card in said stack being removable separately through the open end of the frame to expose the next underlying card and being insertable through the end of the frame to cover the bottom card of the stack to provide answers to the query indicia on the newly exposed top card.
Claim 3
Dependent Claim
37 words
The device of claim 1 including transparent windows secured in the front and back of the frame providing supports for the opposite runs of the belt and isolating the belt from the interior space of the frame.
Claim 4
Dependent Claim
46 words
The device of claim 1 wherein the frame is rectangular, has grooves in the top and bottom sides thereof receiving the marginal top and bottom sides of the stack of cards and has rounded top and bottom surfaces for smoothly guiding the belt around the frame.
Claim 5
Dependent Claim
56 words
The device of claim 1 wherein the indicia on one face of each card in the stack is printed in inverted relation to the indicia on the opposite face of the card so that an upright reading through the windows in both runs of the belt is available by rotating the frame around one side thereof.
Claim 6
Dependent Claim
239 words
A study device comprising a flat rectangular frame defining a pocket open at one end, transparent windowpanes on the top and bottom faces of the frame exposing the pocket to view, a stack of cards removably inserted through the open end of the pocket and fitting in snug relationship in said frame, each of said cards having lines of indicia on both faces thereof, the cards and lines of indicia thereon in said stack being so related that the lines of indicia on the top card of the stack will be exposed to one windowpane and co-related lines of indicia on the bottom card of the stack will be exposed to the other windowpane, said frame having smooth, rounded top and bottom surfaces, an endless opaque belt trained around said frame over said top and bottom surfaces and covering said windowpanes, a first window slot in said belt exposing to view a line of indicia on the top card of said stack in the frame, a second window slot in said belt exposing to view a line of indicia on the bottom card of said stack in the frame, and said window slots being so positioned in the belt over the respective windowpanes that rotation of the belt will selectively and simultaneously expose to view a line of indicia at the top face of the device and a line of co-related indicia at the bottom face of the device.
Claim 7
Dependent Claim
239 words
A study device comprising a flat rectangular frame defining a pocket open at one end, transparent windowpanes on the top and bottom faces of the frame exposing the pocket to view, a stack of cards removably inserted through the open end of the pocket and fitting in snug relationship in said frame, each of said cards having lines of indicia on both faces thereof, the cards and lines of indicia thereon in said stack being so related that the lines of indicia on the top card of the stack will be exposed to one windowpane and co-related lines of indicia on the bottom card of the stack will be exposed to the other windowpane, said frame having smooth, rounded top and bottom surfaces, an endless opaque belt trained around said frame over said top and bottom surfaces and covering said windowpanes, a first window slot in said belt exposing to view a line of indicia on the top card of said stack in the frame, a second window slot in said belt exposing to view a line of indicia on the bottom card of said stack in the frame, and said window slots being so positioned in the belt over the respective windowpanes that rotation of the belt will selectively and simultaneously expose to view a line of indicia at the top face of the device and a line of co-related indicia at the bottom face of the device.
Claim 8
Dependent Claim
29 words
The device of claim 5 wherein the top and bottom faces of the frame have peripheral recesses and the transparent windowpanes have their marginal edges seated in said recesses.
Claim 9
Dependent Claim
26 words
The device of claim 5 wherein the frame has a three-sided internal channel receiving three marginal sides of the stack of cards in snug sliding engagement.
Claim 10
Dependent Claim
167 words
A study device which comprises a flat, rectangular frame having an interior chamber open at one end, a stack of question and answer cards snugly seated in said chamber and removable througH the open end of the frame, said frame having open front and back faces exposing the faces of the top and bottom cards of the stack in the frame, said frame having ledges at the ends of the open front and back faces of the frame, an endless opaque belt trained around said frame having runs covering said open front and back faces thereof and slots in said runs, windowpanes underlying said slots carried by said belts and riding in said ledges, and said slots being positioned so that when the belt is rotated on the frame, a question on the top card of the stack in the frame will be exposed to one slot while the answer to said question on the bottom card of the stack will be exposed to the other slot.
Claim 11
Dependent Claim
167 words
A study device which comprises a flat, rectangular frame having an interior chamber open at one end, a stack of question and answer cards snugly seated in said chamber and removable througH the open end of the frame, said frame having open front and back faces exposing the faces of the top and bottom cards of the stack in the frame, said frame having ledges at the ends of the open front and back faces of the frame, an endless opaque belt trained around said frame having runs covering said open front and back faces thereof and slots in said runs, windowpanes underlying said slots carried by said belts and riding in said ledges, and said slots being positioned so that when the belt is rotated on the frame, a question on the top card of the stack in the frame will be exposed to one slot while the answer to said question on the bottom card of the stack will be exposed to the other slot.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |