Structurally regulated polyphosphazene copolymers
CA 1105477 A · Owner: Armstrong World Industries, Inc. · Inventors: Quinn, Edwin J.; Dieck, Ronald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to polyphosphazenes which have an at least partially regulated structure corresponding to the formula:, ?N3P3(Cl)5(OR1)?n (I) where n is greater than 2, and where R1 is phenyl or substituted phenyl. This invention further relates to copolymers, derived from the above polymers (I) which, correspond to the formula:, ?N3P3(OR1)(OR2)5?n (II) where R1 is phenyl or substituted phenyl and where R2 is different than R1 and is an alkyl or substituted alkyl radical or a phenyl or substituted phenyl radical. These polymers are prepared by polymerizing cyclic triphosphazenes of the formula:, (III) to form the polymers (I) which, in turn are reacted to re-, place the chlorine with …
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 July 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 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.