Water repellent for masonry
CA 1309539 C · Owner: Merrill, Duane F. · Inventors: Merrill, Duane F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a silicone composition for rendering surfaces stain resistant and water repellent comprising: (a) an organopolysiloxane resin selected from the group consisting of resins having R3SiO0.5 units and Si02 units, the ratio of R3SiO0.5 units to Si02 units, ranging from about 0.2 to about 0.9:1 and resins having R3SiO0.5 units, R2Si0 units and Si02 units, the ratio of R3SiO0.5 units to SiO2 ranging from about 0.2 to about 0.9:1 and the ratio of R2SiO units being up to about 0.1:1 where each R is independently selected from substituted or unsubstituted hydrocarbon radical of from 1 to 8 carbon atoms;, (b) alkyl-alkoxypolysiloxane resin; and (c) an effective amount of condensation …
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 October 27, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 27, 2009.
- 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.