Portable water purification system
CA 2079809 A1 · Owner: Hembree, Richard D. · Inventors: Hembree, Richard D.; Sullivan, Brian F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A manually operable water purification system which includes (i) a first container divided by a filter into a first chamber for retaining contaminated water and a second chamber retaining a porous body of biocidally effective material and a plunger sealably, receivable within the first chamber for forcing contaminated water retained within the first container through the filter and the porous body of biocidally effective material. The filter permits passage of smaller microbiological pathogens which may be effectively chemically controlled, such as bacteria and viruses while, preventing passage of larger microbiological pathogens which are difficult to chemically control, such as cysts.
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 1, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 2013.
- 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.