Porous film manufacturing apparatus
CA 2118056 C · Owner: Kagawa, Seiji · Inventors: Kagawa, Seiji; Kagawa, Yoichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a porous film manufacturing apparatus which can, regularly form a large number of non-through pores with a fine opening width of sub-µm to several tens µm at a high density in elongated films made of various materials, with almost no deterioration in the essential characteristics of the film materials. This porous film manufacturing apparatus includes a feed unit for feeding an elongated film, a perforating unit including a first block having a surface on which a large number of diamond particles with acute corner portions are deposited, a second block having a surface on which a desired protruding pattern is formed, and an elastic organic polymer sheet so arranged as to cover …
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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 13, 1994 and granted December 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 13, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 13, 2016.
- 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.