Article for separations and purifications and method of controlling porosity therein
CA 2110156 A1 · Owner: Markell, Craig G. · Inventors: Markell, Craig G.; Wright, Robin E.; Hagen, Donald F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite article comprising in the unexpanded form, a, fibrillated PTFE matrix and a combination of energy expandable hollow polymeric particles and sorptive particles which composite, on, applying energy such as steam heat, or laser energy, provides an, expanded article having increased void volume and decreased density. The expanded articles are porous and efficient articles for separation and purification applications. In flat or rolled form the composite article can be used in separation devices.
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 May 18, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2014.
- 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.