Manufacture of water-insoluble ammonium polyphosphate
CA 1112841 A · Owner: Cyanamid Canada Inc. · Inventors: Corver, Hans A.; Robertson, Allan J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title: MANUFACTURE OF WATER-INSOLUBLE, AMMONIUM POLYPHOSPHATE ABSTRACT, Preparation of crystalline waterinsoluble ammonium polyphosphate through processing a melt of urea and phosphoric acid or alternatively processing solid urea phosphate. Contact between the exiting product and recycled gaseous by-products ensures proper pH.
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 November 24, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 1998.
- 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.