The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 05, 1978
Filed:
Dec. 20, 1977
Friedrich Krueger, Edingen, DE;
Dieter Palleduhn, Mannheim, DE;
Joh. A. Benckiser GmbH, Ludwigshafen am Rhein, DE;
Abstract
A preparation for inhibiting scale formation in aqueous media with a high threshold activity is prepared by condensation of 2 moles of a mixture of acetic acid anhydride and an acetylhalide in the proportion of 0.2:1.8 to 1.8:0.2 with 0.6 moles to 1 mole crotonaldehyde, thereafter with 0.6 moles to 1 mole of acrylic acid, followed by condensation with 0.6 moles to 1 mole of maleic acid anhydride, and finally by oxidation with nitric acid without isolating any of the resulting intermediate products. Said preparation is added in amounts of 10 mg. to 200 mg. to each liter of aqueous medium to exert its scale formation inhibiting, chelating, sequestering, and/or complexing effect.