Utility insulated cross-arm
CA 1280182 C · Owner: King, Halm C. · Inventors: King, Nancy; King, Halm C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to overcome the disadvantages that wooden cross-arms for supporting electrical insulators for power transmission lines are subject to deterioration and to internal defects in the wood there is provided a utility insulated cross-arm for supporting electrical wires from a utility pole comprising a rigid bar made of insulative material having left and right ends and a central portion. Two diagonal members integral with the bar, are located on either side of the central portion of the bar, the diagonal members being joined at a peak, forming a triangle with said bar. A plurality of support members are mounted one at the peak and others distributed along the bar, each having a support …
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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 February 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 2008.
- 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.