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:
Feb. 29, 2000
Filed:
Aug. 31, 1993
Ernst G Leser, Elkton, MD (US);
James Allan Wingrave, Chadds Ford, PA (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
The present invention relates to a surfactant solution, and to using an aqueous solution of the surfactants, optionally with an antifoaming additive, for removing or washing MFAC contaminants from equipment, sludge, scale, and soil, among others. Examples of MFAC and related contaminants that can be removed by practicing the invention include at least a member of the tetraalkylleads, including but not limited too, tetramethyllead, trimethylethyllead, dimethyldiethyllead, methyltriethyllead, and tetraethyllead. While any suitable surfactant can be used for practicing the invention, an aqueous solution containing at least one member from the group of nonionic alcohol ethoxylates, including but not limited to the polyethoxylated aliphatic alcohols, is particularly effective at removing MFAC contaminants.