Oil well cable
CA 1190291 A · Owner: Biw Cable Systems, Inc. · Inventors: Garshick, Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrical cable for use in oil wells and other hostile environments. The cable includes one or more solid or stranded conductive elements, each of which is covered first by an insulating layer of high-temperature insulation. The insulating layer is covered by a metallic barrier composed of tape or film which may be coated with bonding material. Over the metallic barrier a semiconductive layer is formed, and that in turn may be encased in an armor sheath, the semiconductive layer providing cushioning as well as an electrical connection between the metallic barrier and the armor sheath.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.