US4435692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low electrostatic capacity wire-wound type ignition cable
Assignee: Denso Corp
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Filing: 1982-12-28
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Granted: 1984-03-06
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Expires: 2002-12-28
Abstract
Abstract An ignition cable for supplying voltage to the spark plugs of an internal combustion engine, the cable having a low electrostatic capacity such that it does not produce noise in an FM radio frequency band. A central reinforcing string made of aramido-type fibers is covered by a ferrite core. A resistance wire having 8,000-14,000 turns/meter is wound onto the core. The assembly is then coated with a polyolefin insulation layer, a crossed-fiber reinforcement layer, and a silicon sheath, respectively.
Inventors
- 👤 Yoshimi Miyamoto
- 👤 Naotaka Nakamura
- 👤 Fumiyoshi Akaku
- 👤 Katsumi Koto
- 👤 Tsutomu Kosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:23
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/0063
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
79 words
A low electrostatic capacity wire-wound type ignition cable, comprising: a central reinforcing string; a ferrite core having a diameter of 1.3 mm or less formed on said central reinforcing string; a resistance wire, said wire being wound on said ferrite core to form a coil having 8,000 to 14,000 turns/m, said coil having an inductance of about 800 μH/m; and an insulating layer formed on said coil, said insulating layer comprising a first material having a low dielectric constant.
Claim 2
Dependent Claim
79 words
A low electrostatic capacity wire-wound type ignition cable, comprising: a central reinforcing string; a ferrite core having a diameter of 1.3 mm or less formed on said central reinforcing string; a resistance wire, said wire being wound on said ferrite core to form a coil having 8,000 to 14,000 turns/m, said coil having an inductance of about 800 μH/m; and an insulating layer formed on said coil, said insulating layer comprising a first material having a low dielectric constant.
Claim 3
Dependent Claim
46 words
The low electrostatic capacity wire-wound type ignition cable as recited in claim 1, wherein said ferrite core is formed by extrucing a mixture which is prepared by kneading a base polymer of 100 parts by weight and ferrite powder of 300 to 700 parts by weight.
Claim 4
Dependent Claim
37 words
The low electrostatic capacity wire-wound type ignition cable as recited in claim 2, wherein said base polymer is selected from the group consisting of chlorinated polyethylene, polyolefin resin, ethylene propylene diene mixture rubber (EPDM) and silicone rubber.
Claim 5
Dependent Claim
21 words
The low electrostatic capacity wire-wound type ignition cable as recited in claim 1, wherein said first material comprises a polyolefin resin.
Claim 6
Dependent Claim
28 words
The low electrostatic capacity wire-wound type ignition cable as recited in claim 4, wherein said polyolefin resin comprises a blend of a polyethylene and a non-crystalline polyolefin resin.
Claim 7
Dependent Claim
29 words
The low electrostatic capacity wire-wound type ignition cable as recited in claim 4, wherein said polyolefin resin comprises a blend of a polyethylene and a non-crystalline ethylene propylene rubber.
Claim 8
Dependent Claim
27 words
The low electrostatic capacity wire-wound type ignition cable as recited in claim 4, wherein said polyolefin resin comprises a blend of a polyethylene and an ethylene-α-olefin copolymer.
Claim 9
Dependent Claim
21 words
The low electrostatic capacity wire-wound type ignition cable as claimed in claim 1, wherein said central reinforcing string comprises aramido-type fibers.
Claim 10
Dependent Claim
32 words
The low electrostatic capacity wire-wound type ignition cable as claimed in claim 1, further comprising: a reinforcing layer formed on said insulating layer, said reinforcing layer comprising a braid of glass fibers.
Claim 11
Dependent Claim
21 words
The low electrostatic capacity wire-wound type ignition cable as recited in claim 9, wherein said reinforcing layer comprises a perforated tape.
Claim 12
Dependent Claim
23 words
The low electrostatic capacity wire-wound type ignition cable as recited in claim 9, wherein said reinforcing layer is covered with a sheath layer.
Claim 13
Dependent Claim
23 words
The low electrostatic capacity wire-wound type ignition cable as recited in claim 1, further comprising: a sheath layer formed on said insulating layer.
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |