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:
Aug. 09, 1994
Filed:
May. 29, 1991
Applicant:
Inventors:
Sayed S Shah, St. Louis, MO (US);
William F Fahey, St. Louis, MO (US);
Bernardus A Oude Alink, St. Louis, MO (US);
Assignee:
Petrolite Corporation, St. Louis, MO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23F / ;
U.S. Cl.
CPC ...
252390 ; 252-8555 ; 422 16 ; 546348 ; 106 1443 ; 106 1416 ; 106 1415 ;
Abstract
A method for inhibiting corrosion of ferrous surfaces in an acidic, aqueous medium is disclosed. The method comprises incorporating into the medium a corrosion-inhibiting amount of a pyridine salt composition (comprising a quaternary pyridine salt composition and/or a pyridine.HCL salt composition) and a cationic surfactant that forms a bilayer on the ferrous surfaces in the medium. Highly quaternized pyridine salt compositions useful in such method and a method for preparation of such compositions are also disclosed.