Patent US1978912A successfully refreshed from Google Patents.
US5202946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High count transmission media plenum cables which include non-halogenated plastic materials
Assignee: Avaya Technology LLC
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Filing: 1992-02-20
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Granted: 1993-04-13
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Expires: 2012-02-20
Abstract
Abstract A cable which may be used in buildings in concealed areas such as in plenums or in riser shafts includes a core (22) which in a metallic conductor cable includes at least twenty-five transmission media each of which is enclosed with a non-halogenated plastic material. The core is enclosed with a jacket (28) which also is made of a non-halogenated plastic material. The non-halogenated plastic material of the insulation is selected from the group consisting of a polyetherimide and a silicone-polyimide copolymer, or a blend comprising the polyetherimide and the silicone-polyimide copolymer. For the jacket, the plastic material includes a blend composition of silicone-polyimide copolymer and a flame retardant and smoke suppressant system comprising titanium dioxide and zinc borate.
Inventors
- 👤 Tommy G. Hardin
- 👤 Behrooz A. Khorramian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:04
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/4436; G02B6/4415
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A communications cable, which is suitable for building plenum use, said cable comprising: a core which comprises a relatively large number of communications transmission media, each communications transmission medium being enclosed with a plastic material which is selected from the group consisting of a polyetherimide, a silicone-polyimide copolymer, and compositions which include a polyetherimide and a silicone-polyimide copolymer; and a jacket which encloses said core and which comprises a plastic material comprising a silicone-polyimide copolymer and a system comprising a composition which includes titanium dioxide and zinc borate that enhances the flame retardancy and smoke suppression characteristics of said cable sufficiently to protect a relatively large number of transmission media.
Claim 2
Dependent Claim
110 words
A communications cable, which is suitable for building plenum use, said cable comprising: a core which comprises a relatively large number of communications transmission media, each communications transmission medium being enclosed with a plastic material which is selected from the group consisting of a polyetherimide, a silicone-polyimide copolymer, and compositions which include a polyetherimide and a silicone-polyimide copolymer; and a jacket which encloses said core and which comprises a plastic material comprising a silicone-polyimide copolymer and a system comprising a composition which includes titanium dioxide and zinc borate that enhances the flame retardancy and smoke suppression characteristics of said cable sufficiently to protect a relatively large number of transmission media.
Claim 3
Dependent Claim
28 words
The cable of claim 1, wherein said jacket is a composition which comprises as much as 20% by weight of said composition of titanium dioxide and zinc borate.
Claim 4
Dependent Claim
29 words
The cable of claim 2, wherein said titanium dioxide and said zinc borate each is included in the amount of about 0.5 to 15% by weight of said composition.
Claim 5
Dependent Claim
23 words
The cable of claim 1, wherein said blend composition comprises 1% by weight of titanium dioxide and 1% by weight of zinc borate.
Claim 6
Dependent Claim
36 words
The cable of claim 1, wherein said jacket is a composition which comprises a polyetherimide and a silicone-polyimide copolymer and as much as about 20% by weight of said composition of titanium oxide and zinc borate.
Claim 7
Dependent Claim
20 words
The cable of claim 1, which also includes a core wrap which is disposed between said core and said jacket.
Claim 8
Dependent Claim
22 words
The cable of claim 1, which also includes a metallic shield, said metallic shield being disposed between said core and said jacket.
Claim 9
Dependent Claim
33 words
The cable of claim 1, wherein each transmission medium in said core comprises an optical fiber and said plastic material which encloses said optical fiber is a buffer layer comprising a silicone-polyimide copolymer.
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) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |