US3570359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Key member device
Assignee: Nippon Gakki Co Ltd
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Filing: 1969-11-18
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Granted: 1971-03-16
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Expires: 1989-11-18
Abstract
Abstract A key member device is provided with a plurality of white key members and black key members regularly arranged by a chromatic scale. Each of the black key members has protrusions sidewise extending therefrom in a manner to contact the upper or lower surface of the adjacent white key members near or at a position at which each of the key members is rotatably supported.
Inventors
- 👤 Junji Ohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:38
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/32; G10H1/34; G10H1/344; G10C; G10C3/00; G10C3/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A key member device provided with a plurality of white key members and black key members regularly arranged by a chromatic scale, the upper surfaces of said black key members being higher than that of said white key members, each of said black key members having protrusions sidewise extending therefrom in a manner to face the upper or lower surface of the adjacent white key members near or at a position at which each of the key members is rotatably supported on the upper edge of a supporting member.
Claim 2
Dependent Claim
89 words
A key member device provided with a plurality of white key members and black key members regularly arranged by a chromatic scale, the upper surfaces of said black key members being higher than that of said white key members, each of said black key members having protrusions sidewise extending therefrom in a manner to face the upper or lower surface of the adjacent white key members near or at a position at which each of the key members is rotatably supported on the upper edge of a supporting member.
Claim 3
Dependent Claim
27 words
The key member device claimed in claim 1 in which said protrusions are positioned on the lower surface of the rear portion of said black key member.
Claim 4
Dependent Claim
27 words
The key member device claimed in claim 1 in which said protrusions are positioned on the upper surface of the rear portion of said black key member.
Claim 5
Dependent Claim
36 words
The key member device claimed in claim 1 in which said protrusions are formed by bending outward the cutout portion of the same channeled metal plate from which is fabricated each of the black key members.
Claim 6
Dependent Claim
45 words
The key member device claimed in claim 1 in which each of said adjacent white key members has a rounded portion with its center defined at a point at which said black key member is turnable, and each of said protrusions contacts the rounded portion.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |