Radio frequency sealable permanent antistatic acid copolymer/quaternary amine film
CA 2000856 A1 · Owner: Fowler, Stephen L. · Inventors: Havens, Marvin R.; Fowler, Stephen L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radio frequency polyolefinic film containing an acid copolymer/quaternary amine mixture is disclosed. The film is permanently antistatic. The acid copolymer is a copolymer of (i) a major amount by mol % of an alpha-olefin of the formula RCH=CH2 wherein R is H or C1 to C20 alkyl, and (ii) a minor amount by mol % of an alpha,beta-ethylenically unsaturated carboxylic acid. The quaternary amine is of the formula (R1)(R2)(R3)(R4)N' X- wherein R1 is selected from H, aryl, or C1 to C50 alkyl optionally having one or more non-contiguous C=O or NHC=O or -S- or -O- in the carbon chain or the, same as R2; each of R2, R3, and R4 is the same or different and selected from H, from C1 to C18 alkyl …
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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 October 17, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 17, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2011.
- 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.