Join in the overlapped zone of needle punched bentonite sealing sheets
CA 2072843 A1 · Owner: Heerten, Georg · Inventors: Mueller, Volkard; Heerten, Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Water- and/or oil-tight bentonite sealing sheets or mats are produced which after laying have a water-tight and frictional interconnection or join in the overlapped part thereof. This is achieved by filling the pore space in the overlapped zone with bentonite and following in situ needle punching of the overlapped zone or with bitumen or synthetic resin systems optionally, filled with bentonite, and later bonding or welding of the overlapped zone. It is also possible to weld the overlapped zone together as "films" and then to bond or weld such zones.
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 30, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 30, 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.