Technique for stimulating long intervals
CA 2030103 C · Owner: Mohaupt Family Living Trust · Inventors: Mohaupt, Henry H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gas generating type fracturing tool is designed to work on long productive intervals and includes a series of separate propellant charges, an igniter for initiating combustion of one of the charges and means for transferring combustion from one charge to the next. In one embodiment combustion of the, charges occurs one after another with little or no delay between successive charges. In other embodiments a delay is, incorporated in the combustion train between successive charges. Some embodiments are specifically designed to unplug uncemented slotted liners and have very small gas generation capability.
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 November 15, 1990 and granted October 18, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 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.