US PATENT SUBCLASS 516 / 102
.~.~ The organic material contains organic compound containing nitrogen, except if present solely as NH4+

Current as of: June, 1999
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516 /   HD   COLLOID SYSTEMS AND WETTING AGENTS; SUBCOMBINATIONS THEREOF; PROCESSES OF

98  DF  CONTINUOUS OR SEMICONTINUOUS SOLID PHASE (I.E., SYSTEMS WHICH EXHIBIT PLASTICITY, ELASTICITY, OR RIGIDITY): COLLOID SYSTEMS; COMPOSITIONS CONTAINING AN AGENT FOR MAKING OR STABILIZING COLLOID SYSTEMS; PROCESSES OF MAKING OR STABILIZING COLLOID SYSTEMS; PROCESSES OF PREPARING THE COMPOSITIONS (E.G., GEL, PASTE, GELLED EMULSION, FLOC) {4}
99  DF  .~ The solid phase contains organic material {3}
102.~.~ The organic material contains organic compound containing nitrogen, except if present solely as NH4+ {1}
103  DF  .~.~.~> The compound contains plural peptide linkages, i.e., compound formed from amino acids, natural or synthetic, by reaction of a carboxyl group of one such amino acid with an amino group of another same or different such amino acid

DEFINITION

Classification: 516/102

The organic material contains organic compound containing nitrogen, except if present solely as NH 4+:

(under subclass 99) Subject matter in which the organic* material* contains an organic* compound which contains nitrogen, except for when the nitrogen is present solely as the cationic ammonium group, NH 4+

(1) Note. Materials* used as agents* which are impurely or crudely derived from plant or animal sources, are assumed to contain nitrogen-containing organic* compounds (i.e., the DNA and proteins), unless clearly separated out, such as cellulose, carbohydrate fractions, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

101, for colloid systems in which the solid phase contains an organic* compound which contains nitrogen (except if present solely as NH 4+), which coats, impregnates, or surface modifies an inorganic* material*.

SEE OR SEARCH CLASS

60, Power Plants,

252, for reaction motor (e.g., rockets) wherein the propellant is a gelatinous precipitate.

430, Radiation Imagery Chemistry: Process, Composition, or Product Thereof, 199+, for films used for image forming and transfer (e.g., instant photography) which may include a gel, subclass 404 where a gel or web is used in a developer for nonradiation sensitive image processing, subclasses 495.1+ for film which may contain gel (e.g., gelatin).

530, Chemistry: Natural Resins or Derivatives; Peptides or Proteins; Lignins or Reaction Products Thereof, appropriate subclasses for colloid systems such as gel-like proteins; areas known to have documents related to colloid systems include:

354+, for gelatin, subclass 356 for collagen, subclasses 360+ for casein or caseinate, subclasses 362+ for albumin, subclasses 370+ for plant or yeast proteins, subclasses 380+ for blood proteins (particularly 381+ for blood coagulation

factors and fibrin, e.g., thromboplastin).