Alkaline cleaner and process for reducing stain on aluminum surfaces
CA 2067112 A1 · Owner: Ppg Industries, Inc. · Inventors: Beck, Leslie M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title: ALKALINE CLEANER AND PROCESS FOR REDUCING STAIN ON ALUMINUM SURFACES, Abstract of the Disclosure An aqueous alkaline cleaner and a process are described for reducing the discoloration of aluminum surfaces treated with are aqueous alkaline cleaner compositions. The process comprises including in the aqueous cleaner composition, an effective amount of at least one heterocyclic compound. Enhanced mobility of the aluminum surfaces also can be obtained when the heterocyclic compound is a solid particulate compound which is mixed with an oil prior to addition to the aqueous alkaline cleaner. In a preferred embodiment the heterocyclic compounds are soluble pyrroles imidazoles, pyrazoles, …
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 August 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 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.