US PATENT SUBCLASS 507 / 907
INDICATING MEANS (E.G., DYE, FLUORESCING AGENT, ETC.)

Current as of: June, 1999
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507 /   HD   EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY

907INDICATING MEANS (E.G., DYE, FLUORESCING AGENT, ETC.)

DEFINITION

Classification: 507/907

INDICATING MEANS (E.G., DYE, FLUORESCING AGENT, ETC.):

Subject matter wherein the composition contains an intentionally included indicating means, e.g., dye, fluorescing agent, etc.

(1) Note. These indicating means are included to indicate the condition of the fluid, e.g., contamination, rheology, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

129+, for dyes having an organic nitrogen. For example, methylene blue has an N-heterocycle and is placed in subclass 130.