US PATENT SUBCLASS 436 / 18
.~ Preservative, buffer, anticoagulant or diluent

Current as of: June, 1999
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436 /   HD   CHEMISTRY: ANALYTICAL AND IMMUNOLOGICAL TESTING

8  DF  COMPOSITION FOR STANDARDIZATION, CALIBRATION, SIMULATION, STABILIZATION, PREPARATION OR PRESERVATION; PROCESSES OF USE IN PREPARATION FOR CHEMICAL TESTING {11}
18.~ Preservative, buffer, anticoagulant or diluent

DEFINITION

Classification: 436/18

Preservative, buffer, anticoagulant or diluent:

(under subclass 8) Compositions which are added to a sample for a chemical test which compositions serve to prevent deterioration of the sample, stabilize the pH, prevent the sample from coagulating, or increase the volume of the sample.

SEE OR SEARCH THIS CLASS, SUBCLASS:

176, for a process of stabilizing or preserving a sample for a chemical test.

SEE OR SEARCH CLASS

252, Compositions,

380, for preservate compositions and especially subclass 398 for chemical change inhibitors.

516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

113+, for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), when generically claimed or there is no art class. See note (2) in subclass 113. Class 516 provides for compositions otherwise seemingly proper for Class 436 when the compostions are colloid systems or wetting agents.