Adjustable, leak-free sealing device for polymer dies
CA 2330159 A1 · Owner: E.I. Du Pont De Nemours And Company · Inventors: Huechter, Gerhard Theodor; Moennig, Heinrich; Lamkemeyer, Matthias Hubert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an adjustable leak-free sealing device (20) , for sealing the die orifice (14) of a molten polymer die (10). The sealing device (20) includes a sealing bar (40) seated against and blocking a portion of the die orifice (14), a deckle holder (21) slideably connected to one side of the die (10) and extending under the die orifice (14) and a plurality of , springs (45) seated on the deckle holder (21) and biasing the sealing bar (40) against a portion of the die orifice (14). The springs (45) have a combined spring force equal to or greater than the die orifice outlet pressure such that the sealing bar (40) provides a leak-free seal along a portion of the …
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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 28, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2020.
- 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.