US4471084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm for loudspeakers
Assignee: Victor Company of Japan Ltd
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Filing: 1982-12-22
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Granted: 1984-09-11
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Expires: 2002-12-22
Abstract
Abstract A diaphragm for a loudspeaker is described, which essentially consists of a polyolefin resin such as propylene homopolymer or copolymer with an ethylenically unsaturated copolymerizable monomer or a 4-methylheptene-1 resin and short fibers of potassium titanate. The titanate fibers have an average fiber length of 10 to 30 microns and an average diameter of 0.1 to 0.5 micron.
Inventors
- 👤 Toshikatsu Kuwahata
- 👤 Nobuo Fuke
- 👤 Toshihiro Fukuhara
- 👤 Yoshiaki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:01
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R2307/00; H04R2307/029
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A loudspeaker diaphragm which is made of a resin composition essentially consisting of 70 to 95 wt% of a polyolefin resin selected from the group consisting of (a) polypropylene homopolymer, (b), a copolymer of polypropylene with a minor amount of an ethylenically unsaturated copolymerizable monomer, and (c) 4-methylpentene-1 polymer, said polyolefin resin having been mixed with 30 to 5 wt% of short fibers of potassium titanate, said fibers having an average fiber length of 10 to 30 microns and an average diameter of the fibers of 0.1 to 0.5 micron, the diaphragm having a density over 0.93 gr./cm 3 , inclusive.
Claim 2
Dependent Claim
101 words
A loudspeaker diaphragm which is made of a resin composition essentially consisting of 70 to 95 wt% of a polyolefin resin selected from the group consisting of (a) polypropylene homopolymer, (b), a copolymer of polypropylene with a minor amount of an ethylenically unsaturated copolymerizable monomer, and (c) 4-methylpentene-1 polymer, said polyolefin resin having been mixed with 30 to 5 wt% of short fibers of potassium titanate, said fibers having an average fiber length of 10 to 30 microns and an average diameter of the fibers of 0.1 to 0.5 micron, the diaphragm having a density over 0.93 gr./cm 3 , inclusive.
Claim 3
Dependent Claim
12 words
A diaphragm according to claim 1, wherein said polyolefin is polypropylene homopolymer.
Claim 4
Dependent Claim
18 words
A diaphragm according to claim 1, wherein said polyolefin is polypropylene copolymer with an ethylenically unsaturated copolymerizable monomer.
Claim 5
Dependent Claim
18 words
A diaphragm according to claim 1, wherein said short fibers are in the form of needle-shaped, single crystals.
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) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |