Blowing head
CA 2382385 C · Owner: Barker, Philip Alfred · Inventors: Barker, Philip Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A blowing head for a blown fibre installation the blowing head including means for detecting buckling in the transmission line being installed and decreasing the drive forces applied to the transmission line preventing mechanical damage occurring to the transmission line.
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 September 17, 1997 and granted February 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2019.
- 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.