High-speed processable cellular insulation material with enhanced foamability
CA 2426756 C · Owner: He, Vicky Yafen · Inventors: Wasserman, Scott Hanley; Frankowski, David John; Brown, Geoffrey David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An expandable composition comprising: (A) 60 to 98 percent by weight of a polyolefin or mixture of polyolefins wherein the polyolefin or mixture has a zero-shear viscosity (.eta.0) of less than 9.0 kilopascal.seconds (kPa.s), a recoverable compliance (Jr) greater than 50x10-5/pascals (Pa), and a flow activation energy (Ea) greater than 6.7 kilocalories per mole (kcal/mol); and (B) greater than 2 to 40 percent by weight of a polyolefin or mixture of polyolefins having a normalized relaxation spectrum index (nRSI) greater than 4.5 and no greater , than 19.
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 October 24, 2001 and granted March 20, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 24, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2023.
- 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.