Two-way plugs for wells
CA 2020975 C · Owner: Collins, Dannie R. · Inventors: Gazda, Imre Iwan; Collins, Dannie R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plugging device is described for installation as by wireline tools in a receptacle in a well flow conductor for plugging the flow conductor against flow from below as well as from above. The plugging device includes a tubular housing (100) having seals (76) for sealing with the receptacle and lock members (74) for anchoring it therein. A mandrel (104) is reciprocable in the housing between lower and upper positions for moving the lock members to locking position and for allowing them to move to unlocking position. A plug member (102) closes the housing and is movable relative thereto between lower and upper positions and there is a locking mechanism for locking the plug member to 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 July 11, 1990 and granted October 18, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2012.
- 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.