Apparatus to dry/heat treat continuous web stock of film
CA 2102786 A1 · Owner: The Dow Chemical Company · Inventors: Dixit, Thuan P.; Louks, Paul T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus (10) for the constrained drying and/or heat treating of a continuous roll of film. This apparatus (10) includes a mechanism (46) which grasps a film (112) by its edges and moves said film (112) through a drying zone, with said mechanism (46) holding said film taut without substantial stretching of said film in the drying zone, and a means (104) to remove the evaporated solvent from said apparatus (10). The apparatus (10) is particularly useful for drying film of polybenzoxazole polybenzothiazole and, copolymers thereof as well as molecular composite films. A method of drying/heat treating film is also disclosed.
Read the whole patent
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 March 3, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 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
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.