Cleaning composition, method and apparatus for cleaning exterior windows
CA 2229902 A1 · Owner: Hawes, Charles · Inventors: Hawes, Charles; Jackson, Thomas T. Jr.; Thompson, Mark
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A no scrub/no wipe method for cleaning exterior windows without filming or spotting includes spraying a cleaning composition onto the window surface preparing purified rinse water by passing rinse water through an ion exchange resin and rinsing the window surface with the purified rinse water. A spray gun (12) comprising separate chambers for the cleaning composition (14) and the ion exchange resin (16) is disclosed.
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 June 19, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2019.
- 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.