Method for repairing sewer pipes
CA 1062634 A · Owner: Oil Base · Inventors: Bennett, Robert B.; Mcmordie, Warren C. (Jr.); Taylor, William H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sewer pipe is repaired by inserting a thin flexible liner, within the sewer pipe. The liner has an outer diameter less than the inner diameter of the sewer pipe whereby an annu-, lar space is presented between the liner and the sewer pipe. This annular space is filled with a low viscosity magnesium based cement, such as magnesium oxychloride cement or magnesium oxysulfate cement, which has a maximum Marsh funnel viscosity of 40 seconds per quart.
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
- Granted September 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 1996.
- 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.