Sol-gel encapsulated enzyme
CA 2115671 C · Owner: Nishida, Fumito · Inventors: Zink, Jeffrey I.; Yamanaka, Stacey A.; Ellerby, Lisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An active biological material encapsulated in a glass is formed using a sol-gel process. A metal alkoxide is mixed with water (12) and exposed to ultrasonic energy at pH <= 2 to form a single phase solution which is then buffered to a pH between about 5 and 7 (17). The buffered solution is then mixed with the active biological material (20) and the resultant gel (21) is aged (22) and dried (24). The dried product is a transparent porous glass with substantially all of the added active biological material encapsulated therein (26), the biological material retaining a high level of activity.
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 August 12, 1992 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 2014.
- 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.