Compacted bentonite-based absorbents
CA 2198583 C · Owner: First Brands Corporation · Inventors: Tucker, Edward B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The instant invention generally relates to absorbents formed from compacting bentonite-containing materials containing an effective amount of the bentonite particles of a size under 100 U.S. mesh. The absorbent is compacted under effective compacting pressures to form a bentonite material suitable for use as an absorbent and is characterized as having lower costs increased absorbencyover a similarly sized and compositionally similar non-compacted bentonite-containing materials and/or improved clump strength when used as an absorbent.
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 February 26, 1997 and granted February 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.