Reusable viscous material dispensing apparatus
CA 2203140 C · Owner: Clark, James E. Ii · Inventors: Clark, James E. Ii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reusable viscous material dispensing system has a sealed pressure cylinder (8) with a rounded upper region (14) with an inert gas inlet (29) and a , rounded bottom region (12) with a viscous material ingress and egress opening (28). A pressurizing boat (16) has a lower hull portion (18) which is , weighted with ballast (20) and an upper portion (22). The lower hull portion (18) and upper portion (22) join along a circular interface region (26). The diameter of the circular interface region (26) is smaller than the diameter of the cylinder (8). The boat (16) floats in the cylinder filled with viscous material (23). The viscous material (23) forms a gaseous pressure seal between the …
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 24, 1995 and granted June 6, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2017.
- 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.