Method and apparatus for forming articles made of polyurethane
CA 2123483 C · Owner: Carson, Scott · Inventors: Carson, Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for forming articles made of polyurethane. The apparatus (10) includes a polyol weigh tank (12) an, isocyanate weigh tank (20), an additive tank (26) and a mix tank (16) enclosed by a vent chamber (50). The vent chamber (50) is in communication with inlet (58) and outlet (60) pipes to move air and fumes from the interior of the vent chamber (50) past a filter (64). The apparatus (10) further includes a containment vessel (80) also having inlet (88) and outlet (90) pipes for movement of air and fumes. The containment vessel (80) is in communication with a pump (P) for creating a vacuum in the vessel (80) to reduce pressure in the interior of the vessel (80) in which a …
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 January 5, 1993 and granted August 18, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 5, 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.