System for draining a liquid storage tank
CA 2270212 C · Owner: Witter, Aldyr (Deceased) · Inventors: Witter, Aldyr (Deceased); Da Silva, Claudio Camilo; Francisco, Edu Correa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a system which makes it possible to remove undesirable liquids, generally an aqueous phase which precipitate to the , bottom of tanks for storing liquid products. Use is made of a drainage device (30) which comprises a concave body (31) a seat (26), and an interface float , (8) which has a plug portion (25). This interface float (8) is designed to sink into the product and to float on the aqueous phase. As the level of the aqueous phase drops, the plug portion (25) settles sealingly on the seat (26) halting the drainage operations since all the accumulated aqueous phase has already been drained off. The drainage system may be automatic or manual. In …
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 September 18, 1997 and granted September 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 2019.
- 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.