Composite dental cement composition containing a lanthanide series compound
CA 2131188 C · Owner: Essential Dental Systems, Inc. · Inventors: Cohen, Brett I.; Achan, Douglas M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite dental cement composition that is suitable for application with dental posts for either post insertion in a tooth or during core formation is provided, The cement composition includes a polymer matrix in an amount between about 15 and 50 weight percent, a filler in an amount between about 35 and 80 weight percent and a lanthanide series compound in an amount between about 1 and 20 weight percent. The lanthanide series compound chemically interacts or pushes the air voids out between with the polymer matrix in order to increase compressive strength of the cement composition. Titanium powder may be added in order to increase compressive strength. A fluoride compound may further be …
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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 21, 1993 and granted September 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 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
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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.