Length of material, in particular for filtering, method for its manufacture and applicability
CA 1316465 C · Owner: Thomas Josef Heimbach Gmbh & Co. · Inventors: Janssen, Eberhard; Hunold, Willi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A length of material in particular for filtering pur-, poses is made of or with needle felt supporting an open pore plastic foam. The plastic foam is entirely incorporated into the needle felt. The needle felt may be equipped with a bracing structure that is substantially free from the plastic foam. The needle felt may be formed by fiber non-woven fabrics stitched on both sides on the bracing structure with the plastic foam imbedded on both sides of the needle felt.
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 April 20, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 20, 2010.
- 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.