Solid silicone defoaming
CA 1305642 C · Owner: Shimizu, Hirofumi · Inventors: Morishita, Ken; Shimizu, Hirofumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention disclosed herein provides a solid silicone defoaming agent which comprises: (A) 5 to 60 weight parts by weight of a selfemulsifying defoaming agent compound and (B) 95 to 40 weight parts wax;, wherein said self-emulsifying defoaming agent (A) consists of;, at least 5 weight % of a silicone oil compound comprising:, (a) a silicone oil having a viscosity of at least 20 centistokes at 25 degrees Centigrade, (b) microparticulate silica (c) at least 30 weight % of a polyoxyalkylene and/or polyoxyalkylene/polysiloxane copolymer and optionally, (d) zero to 30 weight % of a water soluble surfactant other than copolymer (C): and, wherein said wax (B) consists of: (i) wax which does not …
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 July 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 28, 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.