Pumpable cement grout
CA 2030628 A1 · Owner: Stephens, Patrick J. · Inventors: Stephens, Patrick J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pumpable cement grout and method for use thereof for grouting of annular cavities. There is a pumpable cement grout having portland cement water, in an amount sufficient so that the water-to-cement ration of the grout is from about 0.60 to about 0.68 by weight, and pregenerated aqueous foam in an amount sufficient to adjust the wet density of the grout to a value of from about 55 to about 72 pounds per cubic foot. The grout is pumped into an annular cavity formed intermediate a tubular external member having a longitudinal extent and an internal member disposed in the tubular external member, so that the grout fills the cavity by flowing in a generally longitudinal direction through 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 November 22, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 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.