A method in making surface-active products consisting of salts of alkali metals or nitrogen bases with fatty acids sulphonic acids or alkyl sulphuric acids

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Listed from its IP Australia record in Patent Yard's archive of Australian patents past their term. Its claims, description and drawings are in the AusPat record and on Google Patents, and the Claude kit works from them.

Why it's free to use

• Filed April 12, 1954. Even if it was granted, its term would have ended by April 12, 1975.
• A pharmaceutical extension adds at most five years, so even that would have ended by April 12, 1980.
• We check Australian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.