Microencapsulated oil field chemicals and process for their use
CA 2134980 C · Owner: Kowalski, Thomas Charles · Inventors: Kowalski, Thomas Charles; Pike, Robert Wayne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Gelatin capsules containing oil field chemicals preferably weighted with a , heavy metal compound are made more stable, under certain conditions by the incorporation of a strong chelating agent. The microcapsules can provide an extended treatment period since many materials that would damage the microcapsules are controlled by the chelating agent.
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 May 3, 1993 and granted August 3, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 3, 2015.
- 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.