Lead/sulphuric acid-accumulator, separator for a lead/sulphuric acid accumulator and process to reduce the formation of dark deposits in a lead/sulphuric acid accumulator
CA 2020539 A1 · Owner: Grace G.M.B.H. · Inventors: Yaacoub, Claudia M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lead-accumulator with at least one separator made from filled poly-olefins is described in which the formation of coloured, mostly dark and often adhesive deposits occurring in practice is reduced in quantity. This is achieved by the fact that in the accumulator there, are present one or more non-ionic surfactants of a specific structure the HLB-value of which amounts to at least 5. In addition a separator made from filled poly-olefins is described which contains one or more, of these surfactants.
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 July 5, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 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.