Concrete pipe making machine
CA 2001399 A1 · Owner: Mitchell, William J. · Inventors: Fosse, Navarro T.; Mitchell, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A concrete pipe making machine having a combined vibrating core and counter rotating packerhead assembly is used with a mold to prepack and vibrate concrete within the mold to produce concrete pipe. A controller is programed in response to packing force of the packerhead assembly to control the discharge of concrete into the mold and the lift speed of the core and packerhead assembly to produce concrete pipe having uniform density through out the length of the pipe.
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 October 20, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 20, 2011.
- 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.