Phosphonitrilic chloride esters and process
CA 1051448 A · Owner: Fmc Corporation · Inventors: Tuemmler, William B.; Start, John F.; Orwoll, Edward F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel process the products produced and their, use in rendering rayon flame retardant. The process comprises treating partial esters of phosphonitrilic chloride with a tertiary amine base to form a polymeric phosphazene. The condensed polymeric phosphazenes so produced are very efficacious in rendering rayon flame resistant and they have excellent retention during the process of spinning rayon fibers and in subsequent laundering of fabrics produced from the flame-resistant rayon.
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 March 27, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 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.