US4447122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic sheathed cables
Assignee: STC PLC
•
Filing: 1982-07-01
•
Granted: 1984-05-08
•
Expires: 2002-07-01
Abstract
Abstract A plastic fiber cable has a flame retardant sheath which contains between 10-40% by weight of an inert filler, preferably titanium dioxide, which provides the sheath with thixotropic non-drip properties so that as well as possessing non-flammability properties the sheath when molten will also not drip and thus will not expose more flammable materials, such as the strands, inside the sheath.
Inventors
- 👤 Ralph Sutehall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:43
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29; H01B7/295; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4416; G02B6/4429; G02B6/4436
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A cable comprising: a conductor; and an outer sheath of a relatively low flammability material having incorporated therein means for substantially reducing dripping of said sheath when subjected to a flame, consisting essentially of the following constituents in the proportions by weight: ______________________________________
polyester elastomer 100 parts
flame retardant additive
20 parts
titanium dioxide from 13.3 to 80
parts
______________________________________
Claim 2
Dependent Claim
60 words
A cable comprising: a conductor; and an outer sheath of a relatively low flammability material having incorporated therein means for substantially reducing dripping of said sheath when subjected to a flame, consisting essentially of the following constituents in the proportions by weight: ______________________________________
polyester elastomer 100 parts
flame retardant additive
20 parts
titanium dioxide from 13.3 to 80
parts
______________________________________
Claim 3
Dependent Claim
22 words
The cable as claimed in claim 1 further comprising a main tensile strength member located between the conductor and the outer sheath.
Claim 4
Dependent Claim
21 words
The cable as claimed in claim 2 wherein the main tensile strength member comprises a material of a relatively high flammability.
Claim 5
Dependent Claim
18 words
The cable as claimed in claim 3 wherein the relatively high flammability material is a stranded plastic material.
Claim 6
Dependent Claim
28 words
The cable as claimed in claim 3 wherein said conductor includes a central former, and a plurality of optical fibers disposed on the outside of the central former.
Claim 7
Dependent Claim
23 words
The cable as claimed in claim 1 wherein the titanium dioxide has a particle size substantially in the range between 0 to 10μ.
Claim 8
Dependent Claim
32 words
The cable as claimed in claim 5 further comprising: a tape wrapping located on the outside of the fibers, the tape being disposed on the inside of the relatively high flammability material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |