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:
Jan. 27, 1987
Filed:
May. 30, 1985
Lawrence E Ball, Akron, OH (US);
William M Griffin, Chesterland, OH (US);
Kathleen M Wallace, Chardon, OH (US);
Amy L Nemecek, Garfield Heights, OH (US);
The Standard Oil Company, Cleveland, OH (US);
Abstract
A polymer is disclosed which is represented by the formula ##STR1## wherein: Y is hydrogen, ammonium, an alkali metal or an alkaline earth metal; R.sup.1 and R.sup.3 are independently hydrogen or alkyl groups of 1 to about 3 carbon atoms; R.sup.2 is hydrogen or an alkyl group of 2 to about 3 carbon atoms, and R.sup.4 is hydrogen or an alkyl group of 1 to about 3 carbon atoms, with the proviso that R.sup.2 is not the same as R.sup.4 and either R.sup.2 or R.sup.4 is hydrogen; m is a number sufficient to provide the acid or salt portion of said polymer at a level of from about 10% to about 90% by weight of the total weight of said polymer; n is a number sufficient to provide the amide portion of said polymer at a level of from about 10% to about 90% by weight of the total weight of said polymer; and x is a number sufficient to provide said polymer with a molecular weight of at least about 100,000. A method for recovering oil from a subterranean formation comprising injecting into said formation an aqueous composition comprising a thickening amount of the foregoing polymer is also disclosed.