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. 10, 1995
Filed:
Mar. 18, 1993
Akihiko Niizawa, Yokohama, JP;
Masahiro Yamaguchi, Yokohama, JP;
Nippon Petroleum Refining Co., Ltd., Tokyo, JP;
The Japan Petroleum Institute, Tokyo, JP;
Abstract
A set of standard materials, which comprises at least two kinds of standard materials, for calibration of a photoelectric colorimeter used for the instrumental measurement of petroleum products for their ASTM color, comprising at least two kinds of standard materials each of which is a mixed solution having a color corresponding to an ASTM color and comprises (a) at least five members selected from the group consisting of seven specific colorants such as 3-methyl-1-phenyl-4-(phenylazo)-pyrazol-5-ol, 1-(phenylazo)-2-naphthalenol and 1-[[4-[(dimethylphenyl)azo]dimethylphenyl]azo]-2-naphthalenol, (b) 1-phenyl-1-xylylethane as a solvent for said colorants, and (c) dodecane as a diluent; and a method for instrumental measurement of petroleum products for their ASTM color by a photoelectric colorimeter, which comprises calibrating the photoelectric colorimeter by the use of said at least two kinds of standard materials.