Polyisocyanurate boards with reduced moisture absorbency and lower air permeability and related methods
CA 2217660 A1 · Owner: Bfs Diversified Products, Llc · Inventors: Letts, John B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite iso board (10) comprises a foam core (11) selected from the group consisting of polyisocyanurate and polyurethane materials and mixturesthereof; and first and second facers (12 13), between which the foam core is, sandwiched the facers comprising a sheet selected from the group consisting of polyamides and polycarbonates. A method of reroofing a roof comprises applying composite iso boards of the present invention to a roof deck; and applying a weather protective layer over the iso boards. A continuous method of making a composite iso board comprising the steps of feeding a first layer offacer material into a laminator (24); depositing a foamable polymer liquid onto the first …
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 7, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 2019.
- 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.