Filter device
CA 2059758 C · Owner: Nieweg, Heinrich · Inventors: Nieweg, Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter device with a filter container (1) closed on all sides, into the bottom of which a cartridge-shaped filter insert (2) has been inserted, under which a filtrate catch reservoir (6) is disposed. An air supply tube (40) is inserted into the filter container (1), which terminates on the inside in an air compensation hole (3) at an adjustable height (A) above the inlet of the filter insert (2), so that the corresponding hydrostatic pressure of the liquid (F) determines the flow-through speed of the filtrate. The air supply tube (40) terminates at the bottom above the filtrate outlet of the filter insert (2) so that a, filtrate build-up terminates on the corresponding level (MN) and the …
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 January 21, 1992 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 2014.
- 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.