Combined polystyrene and polyurethane vacuum insulating panel and the use thereof for producing insulating elements
CA 2294854 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Dietrich, Karl Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a vacuum insulating panel consisting of a) two foam pads (3, 4) placed flat on top of each other where one pad consists of open-, cell polystyrene foam (4) and the other pad of open-cell polyurethane foam (3), and b) a foil (1) enclosing both pads which foil is evacuated and sealed , in a gas-tight manner. The invention further relates to the use of said vacuum insulating panels for producing insulating elements of the type used for , example, for the outer walls of refrigerators.
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 June 19, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2020.
- 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.