What follows are the subclasses from one class of the Manual of Classification for US patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retrieve patent titles by entering the class/subclass in the box below.
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363-131 121-55A 14-.5
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Class Number: 503 Class Title: RECORD RECEIVER HAVING PLURAL LEAVES OR A COLORLESS COLOR FORMER, METHOD OF USE, OR DEVELOPER THEREFOR Subclass Subclass Number Title 200 HAVING A COLORLESS COLOR-FORMER, DEVELOPER THEREFOR, OR METHOD OF USE 201 .Method of use, kit, or combined with marking instrument or organ 202 .Color developed by mere decomposition of color-former 203 .Duplicating master 204 .Plural colors or plural diverse systems 205 .Having a color desensitizer 206 .Component noncoextensive with substrate 207 .Having nonreactant particles of defined size 208 .Having constituent defined in terms of melting temperature 209 .Having nonchromogenic liquid spread-control or transfer-improving agent or component, color modifier, stabilizer or preservative 210 .Heavy metal reactant 211 ..Metal of atomic number 22-30 212 ...Zinc 213 .Identified solvent or dispersant for color-former, other than mere mineral oil 214 .Identified reactant isolating material or capsule wall material or binder resin 215 ..Synthetic resin capsule walls 216 .Identified organic electron acceptor (developer) other than phenolic resin 217 ..And identified color-former 218 .Identified color-former 219 ..And identified inorganic electron acceptor (developer), other than mere clay 220 ..Furanone moiety-containing 221 ...Fluoran or derivative 222 ....Molecule having plural fluorans or more than three rings fused together 223 ..Azole moiety-containing 224 ..Polyphenylmethane moiety-containing 225 .Identified electron acceptor (developer) 226 .Spatial relationship specified between color-former and developer 227 HAVING PLURAL INTERACTIVE LEAVES