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:
Jul. 16, 2019
Filed:
Jun. 01, 2015
Restrack As, Kjeller, NO;
Stephen J. Sayfritz, Kjeller, NO;
Alexander Krivokapic, Kjeller, NO;
RESTRACK AS, Kjeller, NO;
Abstract
A family of organic tracers is proposed for single well chemical tracer tests, for example for the measurement of residual oil in petroleum reservoirs. The tracers consist of at least one ester of (hydroxyalkyl) benzoic acid of formula (I), wherein at least one of Rto Ris a hydroxy alkyl group —R—OH and each of the remaining Rto Rgroups is independently selected from H, F, Cl, Br, I, CFCFCl, CFCl, CCland at least one of these remaining Rto Rgroups is not H, Ris selected from CH, CH, CH, CH, CF, CHCF, CCl, CHCCl, CHCHCl, CHCHCl, CHCF, CHCHF, CHCHF, CHCHCHF, CHCHCHF, CHCHCF, CHCHCHCl, CHCHCH—Cl, CHCHCCl, CHF, CHF, CHF, CHCl, CHCl, CHClor a halogenated (hydroxymethyl)phenol and Ris selected from CH, CH, CH, CH.