Filters
CA 1069059 A · Owner: Hoechst Aktiengesellschaft · Inventors: Von Reppert, Rudiger L.; Ott, Karl-Heinz; Hilscher, Eduard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter device suitable for filtering sludges which comprises A) a tube-like filter as an outer wall consisting of a fabric of polyester or polyamide filament yarn which acts as a support for B) an inner layer consisting of a non-woven fabric of man-made fibres wherein the inner layer B) and the support A) are not mechanically connected to each other and a process of dewatering industrial sludge by means of that filter device.
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
- Granted January 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 1, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.