Method and device for cleaning a dirty surface
CA 2269779 A1 · Owner: H.T. Research B.V. · Inventors: Winters, Antonius Paul Leo Maria
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and a device for cleaning a dirty surface wherein water is squirted , from a nozzle against the dirty surface in order to wash away the dirt with the water, characterized in that compressed air is supplied to the water in a mixing chamber (12), which is located upstream of the nozzle at a , predetermined pressure, after which the water is squirted against the dirty surface in a spray of droplets, downstream of the nozzle.
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 October 10, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 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.