Magnetic recording medium comprising binder that may be cured using both isocyanate and radiation curing techniques
CA 2135484 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Muggee, John M.; Anderson, Jeffrey T.; Mosbey, Deral T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic recording medium comprising a magnetizable layer provided on a nonmagnetizable support. The magnetizable layer comprises a magnetic pigment dispersed in a cured binder. The cured binder is derived from binder materials comprising: (a) a first polymer having a Tg of about 60 ·C or more wherein said first polymer , comprises a plurality of isocyanate cross-linkable hydroxy groups and a plurality of radiation cross-linkable groups; and (b) a second polymer having a Tg of about 25 ·C or less wherein said, second polymer comprises a plurality of isocyanate cross-linkable hydroxy groups and a plurality of radiation cross-linkable curable groups, wherein the weight ratio of the second …
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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 May 3, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have 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
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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.