US3647931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drumhead
Assignee: Individual
•
Filing: 1970-11-16
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Granted: 1972-03-07
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Expires: 1990-11-16
Abstract
Abstract A drumhead comprising an upper ring member and a lower ring member which are provided on the confronting surfaces thereof with a plurality of projections and a plurality of recesses respectively at a predetermined interval for interlocking engagement with each other, and a drum sheet having a plurality of through-holes formed in the peripheral edge portion at a predetermined interval at locations corresponding to said projections respectively, said drum sheet being clamped between said upper and lower ring members with said projections extending through said through-holes and secured thereto by means of an adhesive.
Inventors
- 👤 Yoshiyuki Koishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:24
CPC Classifications
G; G10; G10D; G10D13/00; G10D13/01; G10D13/02; G10D13/10; G10D13/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
A drumhead comprising an upper ring member and a lower ring member which are provided on the confronting surfaces thereof with a plurality of projections and a plurality of recesses respectively at a predetermined interval for interlocking engagement with each other, and a drum sheet having a plurality of through-holes formed in the peripheral edge portion at a predetermined interval at locations corresponding to said projections respectively, said drum sheet being clamped between said upper and lower ring members with said projections extending through said through-holes and secured thereto by means of an adhesive.
Claim 2
Dependent Claim
94 words
A drumhead comprising an upper ring member and a lower ring member which are provided on the confronting surfaces thereof with a plurality of projections and a plurality of recesses respectively at a predetermined interval for interlocking engagement with each other, and a drum sheet having a plurality of through-holes formed in the peripheral edge portion at a predetermined interval at locations corresponding to said projections respectively, said drum sheet being clamped between said upper and lower ring members with said projections extending through said through-holes and secured thereto by means of an adhesive.
Claim 3
Dependent Claim
31 words
A drumhead as defined in claim 1, wherein said upper and lower ring members are provided with an annular shoulder and an annular wall respectively for interlocking engagement with each other.
Claim 4
Dependent Claim
29 words
A drumhead as defined in claim 1, wherein said projections formed on the upper ring member and said recesses formed in the lower ring member are frustoconical in shape.
Claim 5
Dependent Claim
19 words
A drumhead as defined in claim 1, wherein said upper and lower ring members are made of synthetic resins.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |