Piston mold
CA 2101003 C · Owner: Preiser, Roland Martin · Inventors: Preiser, Roland Martin; Parsley, Clovis Lee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A piston casting mold for casting all, pistons in a single series with little weight variation one from the next, wherein spacers of fixed dimensions are employed to locate a dome-forming core of the mold a fixed distance from a stationary portion of the mold from one casting to the next. Increasing or decreasing the dimensions of the spacer permits increasing or decreasing the as-cast weight of the piston.
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 July 21, 1993 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 21, 2015.
- 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.