US3765294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teaching device for attachment to a keyboard instrument
Assignee: Castillo J Del
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Filing: 1972-06-29
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Granted: 1973-10-16
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Expires: 1992-06-29
Abstract
Abstract A device non-integral with the keyboard instrument with which it is used is activated through sheet, card or substitute keyboard means to activate in turn indicating heads mounted over the keyboard of an organ, piano or similar instrument and which designate the keys to be played by lighting or solenoid controlled means. The control sheet or card may utilize raised, indented, or apertured sheets or cards detected through various type contact or photocell means which feed the signal through an elelctronic relay to the indicating means.
Inventors
- 👤 Castillo J Del
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:09
CPC Classifications
G; G10; G10G; G10G1/00; G10G1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A record sheet means for use with a plurality of contact means, said sheet means moving relatively to said contact means in a predetermined direction, a plurality of raised contact surfaces on said sheet means for co-acting with said contact means to activate said contact means, each of said raised contact surfaces comprising a pair of raised portions having a v-shaped groove between them extending in said predetermined direction, the bottom portion of said groove raised above the surface of the sheet means, and each of said contact surfaces having beveled downwardly and outwardly sloping sides at the ends of the v-shaped groove.
Claim 2
Dependent Claim
103 words
A record sheet means for use with a plurality of contact means, said sheet means moving relatively to said contact means in a predetermined direction, a plurality of raised contact surfaces on said sheet means for co-acting with said contact means to activate said contact means, each of said raised contact surfaces comprising a pair of raised portions having a v-shaped groove between them extending in said predetermined direction, the bottom portion of said groove raised above the surface of the sheet means, and each of said contact surfaces having beveled downwardly and outwardly sloping sides at the ends of the v-shaped groove.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |