Process for the dyeing of synthetic fibers
CA 1053857 A · Owner: Hoechst Aktiengesellschaft · Inventors: Von Der Eltz, Hans-Ulrich; Wassmuth, Hans-Joachim; Reuther, Albert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the exhaust dyeing of wound bodies of synthetic fiber materials with water-insoluble developing black dyestuffs on the basis of the diazo and oxydation dyeing technique wherein the wound-up textile, material is heated to temperatures in the range of from 105° to 135° C in a pressure-tight dyeing vessel by replacing the air in said dyeing vessel by saturated or superheated steam, preparing the total dyebath in a separate batch vessel, which is likewise pressure-tight but connected with said dyeing vessel by pipes, also heating said dyebath to temperatures in the range of from 105° to 135°C. Control is maintained of the temperature within the mentioned limit values, the steam …
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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 May 8, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 8, 1996.
- 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.