Sealing sheeting of swellable clay impervious to water and/or oil
CA 2089331 A1 · Owner: Heerten, Georg · Inventors: Heerten, Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides sealing sheeting of swellable clay impervious to water and/or oil which essentially consist of a porous material in, whose pores swellable clay is lodged and which on either side are provided with covering layers, of which at least one consists of a water-soluble coating. Such sealing sheeting has water permeability coefficients in its overlap joins which are of the same order as in the sealing sheeting itself. Furthermore in situ needle punching of the overlapped join is possible in order to produce a strong composite structure providing that one overlapped join is produced by sealing sheeting which has a non-woven, material as a porous substrate material.
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 February 11, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 2015.
- 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.