One-way guided filter pad assembly
CA 2064927 C · Owner: Gardner, John Gregory · Inventors: Gardner, John Gregory; Bernard, Richard Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved filter pad assembly, for supporting a filter pad used in, conjunction with a filter system having a pumping unit to filter a contaminated fluid. Included in the filter pad assembly are a filter pad support member a, sealing member, and securing means for maintaining the filter pad support member and sealing member in a closed operative position during the filtering process such that a substantially fluid-tight seal is created therebetween. Thus the contaminated fluid is prevented from exiting the filter pad assembly withoutpassing through the filter pad. The filter pad assembly may be defined to include or not include, the filter pad. The filter pad assembly and filter pad also …
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 April 2, 1992 and granted December 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 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.