Immobilized enzyme for removal of residual cyclodextrin
CA 2194068 C · Owner: Shieh, Wen · Inventors: Hedges, Allan; Shieh, Wen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The immobilized enzyme for removal of residual cyclodextrins is either a combination of an alpha-amylase and a CGTase which has been immobilized or a fungal alpha-amylase which has been immobilized. In addition to either the fungal alpha-amylase or the CGTase and alpha-amylase a debranching enzyme can , also be employed. When using a debranched enzyme the debranched enzyme is , also immobilized. By using the immobilized enzyme the step of inactivating , the enzyme is eliminated and the contamination due to the inactivated enzyme is also eliminated.
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 23, 1995 and granted April 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2017.
- 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.