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Expired Canadian patentCanada

Capillary movement of water in masonry structures

CA 2216232 C · Owner: Kristiansen, Hans · Inventors: Kristiansen, Hans

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A method for dehydrating capillary materials such as moist walls and/or floors of a building structure of masonry or concrete through the principle of electro-, osmosis by applying pulsating DC voltage of a specific pulse pattern to primary, electrode means embedded in said structure said primary electrode means (4), forming anode means and secondary electrode means (5) embedded in the ground outside the structure and forming cathode means to be interactive with said anode, means, said pulsating voltage having a pulse pattern with a total pulse period T, comprised of a positive pulse of duration T+ a negative pulse of duration T-, and a neutral period or pause of duration Tp wherein:, …

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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 8, 1997 and granted July 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 8, 2017.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 8, 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.
FiledOctober 8, 1997
GrantedJuly 23, 2002
Term endedOctober 8, 2017
Patent numberCA 2216232 C
Classification (IPC)E02D31/02 +1 more

Timeline

Timeline From CIPO dates

1998200020022004200620082010201220142016Application filedOct 8, 1997Patent grantedJuly 23, 2002Term endedOct 8, 2017

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.