Filters
CA 2093209 A1 · Owner: Eastman Kodak Company · Inventors: Pummell, Leslie J. H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Various types of filters are known. However regardless of the, size of the filter, there may be problems associated with storing filters prior to use and also with their disposal after use. Described herein is a disposable filter (10) including a flexible casing (12, 14) and at least one filter element (16 18, 20). The, flexible casing (12, 14) and filter elements (16 18, 20) are, expandable from a substantially flat form for use and are collapsible to a substantially flat form after use for disposal.
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 October 2, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2013.
- 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.