Modified silicone rubber for use in the sanitation of sewers in conjunction with specially equipped packers
CA 2042332 A1 · Owner: Meussdoerffer, Johann N. · Inventors: Kapps, Manfred; Vehlewald, Peter; Meussdoerffer, Johann N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to modified silicone rubber containing, as internal mould release agent a, linear polysiloxane having the following structures or, in which R stands for methyl or phenyl R' for methyl, and R" for phenyl and y and x are adjusted to produce a viscosity of from 50 to 2000 mPa.s at 25°C and result in a methyl to phenyl ratio in the polysiloxane of 2.5 to 0.6 and the use of said modified silicone rubber for the production of packers fox sealing damaged sewer systems. Le A 27 686
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 May 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 2013.
- 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.