Plenum cable
US5744757A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | May 3, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L27/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A plenum cable having a plurality of twisted pair conductors enclosed by a jacket. A plurality of the twisted pair conductors has one insulating material thereon and at least one twisted pair conductor has a different insulation material thereon. In the preferred structure at least one twisted-pair conductor has flame retardant polyethylene or flame retardant polypropylene insulation and at least one other twisted pair conductor being insulated with fluorinated ethylene propylene, tetrafluoroethylene, or ethylenechloro-trifluoroethylene. The preferred twisted pair conductors have a center-to-center distance along any point of a 1000 ft. twisted pair conductor that is .+-.0.3 of an average center-to-center distance and/or have an impedance of 90 to 110 ohms and a variation of .+-.0.05 when measured at 10 MHz to 200 MHz from an average impedance and/or have their dielectric layers joined together along the length of the dielectric layers and having an adhesion strength between said dielectric layers of from about 0.1 to about 5 lbs. force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.