Biodegradable polyurethane capsules and manufacturing method thereof
CA 2435172 A1 · Owner: Chung, Ik-Soo · Inventors: Han, Kyu-Teck; Lee, In-Gyu; Choi, Jung-Hoon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to biodegradable polyurethane capsules for molded product of polyurethane foam and to methods for manufacturing the same. the inventive biodegradable polyurethane capsule comprises a powder made from a biodegradable material, first coating layer of calcium alginate gel formed on the surface of said power and second coating layer of foamable polyurethane resin formed on the surface of said first coating layer. Products manufactured from the biodegradable polyurethane capsule according to the present invention can be widely used as heat isolating materials and heat isolating structural materials because the basic physical properties such as heat …
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 January 17, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2024.
- 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.