Load insulator for a lifting device
CA 2114768 C · Owner: Pratt, Hugh M. O. · Inventors: Pratt, Hugh M. O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A load insulator 2, for interposition into a loaded line comprises a plurality of mechanical links 4 connected together to form a chain and an electrical insulator 8 arranged between a pair of adjacent interlocked links 10 12 in the form of an insert of insulative material to electrically isolate the links 10 12 of the pair from each other. Measuring means 24 for measuring the resistance of the insulator 8 are provided to check the electrical condition of the load insulator whilst further means allow for recording of electrical strikes and provide a lifetime expiry indicator.
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
- Filed February 2, 1994 and granted August 21, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 2016.
- 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.