Microporous polymeric foams made with silicon or germanium based monomers
CA 2276033 A1 · Owner: Retzsch, Herbert Louis · Inventors: Dyer, John Collins; Retzsch, Herbert Louis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are polymeric foam materials obtained using monomers based on silicon and/or germanium. The copolymerization of silicon- or germanium-based monomers provide foams that have low glass transition temperatures and low densities. These foams also exhibit relatively high yield stress values which , make the foams suitable for absorption of fluids particularly aqueous fluids , such as urine and menses (when the foams are rendered hydrophilic). The foams have a variety of other uses, including insulation applications.
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 December 5, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 5, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 5, 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.