Mold and mold vent
CA 1323156 C · Owner: Cavender, Keith Douglas · Inventors: Cavender, Keith Douglas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vents for molds can be improved if in place of a single, relatively large vent opening there is used a vent which has, a plurality of relatively smaller vent openings in which the cumulative cross-sectional area of the relatively smaller vent openings are approximately the same as that of the relatively larger vent opening it replaces. It was also found that the vents have a more efficient self-cleaning capability if the ratio of the depth of each vent opening to the cross-sectional diameter of the vent opening is about 1 or less. D-15,931 -49-
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
- Granted October 19, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 19, 2010.
- 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.