Reactive organic filler and the use thereof
CA 1290888 C · Owner: Ivoclar Ag · Inventors: Rheinberger, Volker M.; Buchel, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An organic filler is in the form of a solid powder prepared by non-radical polymerisation. The filler comprises reactive double bonds which are not extractable with solvents in an amount (as determined by the DSC method) of at least 0.5 nmoles/g of the organic filler material. The polymer comprises the reaction product of active hydroxy group-containing (meth)acrylates with isocyanates in an OH-group to NCO-group ratio of approximately 1:1 at least one of the monomers being at least trifunctional. In one embodiment the isocyanate is triisocyanate.
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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
- Granted October 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2008.
- 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.