Method and apparatus for temporary fluid stopage and repair of pipes
CA 2264520 A1 · Owner: Stewart, Randy · Inventors: Stewart, Randy; Tozer, Gerald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention discloses a method and apparatus for temporary fluid stoppage in a pipe carrying a flow of fluid under relatively low pressure. A slot is cut transverse to the axis of the pipe, the slot extending down to the widest inner dimension of the pipe. A block plate having a thickness slightly less than the width of the slot is inserted snugly into the slot. The leading edge thereof is shaped to conform to the inside of the pipe, for example as a semi-circle for a cylindrical pipe, and the block plate blocks the flow of fluid through the pipe. When it is desired to restart the flow of fluid, the block plate is removed and the slot is sealed.
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 March 4, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 4, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 2021.
- 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.