Patent US3680425A successfully refreshed from Google Patents.
US3680425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylindrical drum shell
Assignee: CF Martin and Co Inc
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Filing: 1970-11-27
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Granted: 1972-08-01
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Expires: 1990-11-27
Abstract
Abstract Improved snare, bass and Tom-Tom drums are provided by forming the shell thereof from glass fibers that are bonded together with a resinous material. The glass fibers may be continuous and helically wound over a mandrel or they may be short randomly chopped fibers that form a mat which is applied either to the exterior of a male mandrel or to the interior of a female mold. The method of this invention also contemplates wrapping a band about the resin bonded fibers in order to provide a smooth outer surface. Further, it is also contemplated to provide axially spaced, annular rings at the ends of the shells for providing structural rigidity.
Inventors
- 👤 John Morena
- 👤 Robert N Grauso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:42
CPC Classifications
G; G10; G10D; G10D13/00; G10D13/10; G10D13/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
A musical drum comprising a cylindrical shell composed of glass fibers bonded by a synthetic resin, at least one drum head secured to said shell and a pair of axially spaced, resin bonded glass fiber rings secured to the inner face of said cylindrical shell proximate the opposite ends thereof.
Claim 2
Dependent Claim
50 words
A musical drum comprising a cylindrical shell composed of glass fibers bonded by a synthetic resin, at least one drum head secured to said shell and a pair of axially spaced, resin bonded glass fiber rings secured to the inner face of said cylindrical shell proximate the opposite ends thereof.
Claim 3
Dependent Claim
19 words
The drum in accordance with claim 1 wherein said fibers are continuous and are arranged in a predetermined pattern.
Claim 4
Dependent Claim
22 words
The drum in accordance with claim 1 wherein said resin is selected from a group consisting of epoxy resin and polyester resin.
Claim 5
Dependent Claim
26 words
The drum in accordance with claim 1 wherein said glass fibers are in the form of short segments and are randomly dispersed to define a mat.
Claim 6
Dependent Claim
29 words
The drum in accordance with claim 1 wherein said shell is formed of an initially flat precured sheet having a thickness in the range 0.07 inch to 0.13 inch.
Claim 7
Dependent Claim
22 words
The drum in accordance with claim 5 wherein said sheet is overlapped at the ends and bonded along the common overlapping portion.
Claim 8
Dependent Claim
24 words
The drum in accordance with claim 1 wherein the percentage of glass by weight in the glass-resin composition is between 30 and 70 percent.
References Cited (Backward Citations)
US2609722A
Cited
US2815534A
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US3055058A
Cited
US2977268A
Cited
US3019685A
Cited
US3459093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |