Patent US3717218A successfully refreshed from Google Patents.
US3717218A
Expired / Lapsed
US
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Loudspeaker
Assignee: Nippon Columbia Co Ltd
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Filing: 1971-04-01
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Granted: 1973-02-20
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Expires: 1991-04-01
Abstract
Abstract A loudspeaker having a cone suspension system which is formed of materials such as collagen fiber, a mixture of collagen fiber with other fiber, collagen fiber impregnated with asphalt or latex, or other fibers impregnated with asphalt or latex to improve the frequency response characteristic.
Inventors
- 👤 T Shiga
- 👤 T Takagi
- 👤 Y Arakawa
- 👤 H Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:33
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/16; H04R7/18; H04R7/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
A loudspeaker having a cone with a cone suspension means made of a sheet of randomly aligned collagen fibers and polyvinyl alcohol as a binder.
Claim 2
Dependent Claim
25 words
A loudspeaker having a cone with a cone suspension means made of a sheet of randomly aligned collagen fibers and polyvinyl alcohol as a binder.
Claim 3
Dependent Claim
23 words
A loudspeaker having a cone with a cone suspension means according to claim 1 wherein said randomly aligned collagen sheet includes wood pulp.
Claim 4
Dependent Claim
24 words
A loudspeaker having a cone with a cone suspension means according to claim 1 wherein said randomly aligned collagen sheet includes rayon and cotton.
Claim 5
Dependent Claim
24 words
A loudspeaker having a cone with a cone suspension means according to claim 1 wherein said randomly aligned collagen sheet is impregnated with latex.
Claim 6
Dependent Claim
40 words
A loudspeaker having a cone with a cone suspension means according to claim 4 wherein the amount of latex in said sheet of randomly aligned collagen fibers is about 10 to 50 percent by weight with respect to said sheet.
Claim 7
Dependent Claim
24 words
A loudspeaker having a cone with a cone suspension means according to claim 1 wherein said randomly aligned collagen sheet is impregnated with asphalt.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |