Production of continuous filament fibers from melamine-formaldehyde condensation products
CA 2216872 C · Owner: Basf Aktiengesellschaft · Inventors: Rachwalsky, Uwe; Zettler, Hans Dieter; Gihr, Hartmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is disclosed for producing filaments from a hydroxy- or aminoalkylmelamine-modified melamine/formaldehyde condensation product. The highly concentrated aqueous solution of a melamine/formaldehyde condensation product is filtered, extruded through a spinning nozzle the extruded threads , are dried in a dry shaft by means of hot air and the dried threads are , processed in a tempering furnace at temperatures that rise progressively up to a maximum temperature from 160 to 250 ~C thus hardening the pre-condensed , product.
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 April 22, 1996 and granted July 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 22, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2018.
- 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.