Volume-stable hardened hyraulic cement
CA 1279332 C · Owner: Holub, Edward P. · Inventors: Grabowski, Richard J.; Holub, Edward P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The hardened volume change of concrete grout, patching material, and water-proof material made from blends of a calcium or aluminum sulfate compound Portland cement, and calcium aluminate cement can be reduced by using Portland cement containing low levels (2% maximum) of iron oxide. By lowering the normal level of iron oxide in the Portland cement used in the above composition, it was also discovered that the compressive strengths dramatically increase as well as the bonding capability of the composition to old or cured concrete.
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 January 22, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 22, 2008.
- 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.