US3703040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard teaching aid
Assignee: Individual
•
Filing: 1970-07-06
•
Granted: 1972-11-21
•
Expires: 1990-07-06
Abstract
Abstract A group of hand actuated keys are pivotally mounted on a rod supported by a frame. Means are provided to prevent adjacent keys from interracting with each other while allowing a key to be placed at any angle of rotation in order to provide teaching functions.
Inventors
- 👤 Raymond Roger Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:30
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
Apparatus for teaching arithmetic concepts comprising: A. A frame having spaced apart support portions thereon; B. A rod mounted on said support portions and extending therebetween; C. A plurality of keys mounted on said rod for pivotal movement about said rod between a plurality of positions; D. A spacer on said rod between each pair of adjacent keys with each spacer movably mounted on said rod for movement parallel to the length of said rod with said spacer having locking means for locking it to said frame against rotatable movement around the axis of said rod; and E. Spring means for compressing said keys and spacers along the length of sad rod.
Claim 2
Dependent Claim
112 words
Apparatus for teaching arithmetic concepts comprising: A. A frame having spaced apart support portions thereon; B. A rod mounted on said support portions and extending therebetween; C. A plurality of keys mounted on said rod for pivotal movement about said rod between a plurality of positions; D. A spacer on said rod between each pair of adjacent keys with each spacer movably mounted on said rod for movement parallel to the length of said rod with said spacer having locking means for locking it to said frame against rotatable movement around the axis of said rod; and E. Spring means for compressing said keys and spacers along the length of sad rod.
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US2461926A
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US2629951A
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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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |