Apparatus for two-stage fusion of face-to-face polymeric sheets
CA 2254876 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Fossum, Douglas K.; Field, Gary; Corpus, Paul V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus (117) operative for fusing an amorphous copolyester sheet (14) with a polyvinyl chloride sheet (16) includes a belt assembly (118) having an endless belt (122) received around first and second rollers (124 126). The , apparatus (117) further includes a third roller (158) mounted in cooperation with the first roller (124) to form an input nip with the first roller (124) such that the rollers (124, 158) press the sheets (14 16) together to define , a two-piece structure (12) having a polyvinyl chloride side and an opposing amorphous copolyester side. The polyvinyl chloride side is positioned adjacent to the first roller (124). The apparatus (117) still further includes a …
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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 7, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 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
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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.