Derwent Innovations Index SM目录| 索引| 关闭帮助德温特分类代码Derwent 采用适用于所有技术的简单分类系统对专利文献进行分类。
Derwent 的学科领域专家对所有专利统一使用这种独特的分类方法，从而可以在特定的技术领域进行高效精确的检索。
在数据库中，专利分为以下三大领域。
z化学 (A - M)z工程 (P - Q)z电气和电子 (S - X)这些领域又分为 20 个主要的学科领域或专业。
并将其分别指定为 A-M（化学）、P-Q（工程）和 S-X（电气和电子）。
这些专业再进一步分类。
每个类别都包含代表专业的字母，后面跟随两位数字。
例如，X22 是汽车电工学的分类符号，C04 是所有化肥的分类符号。
与其他检索条件组配使用时，这些分类允许您精确有效地将检索范围限制为相关的学科领域。
例如，模糊词 WARN 可以与 X22（汽车电工学）组配以便只检索有关汽车报警设备的参考文献。
Derwent 对各个条目进行交叉分类以确保检索时可以检索到所有感兴趣的专利。
检索辅助工具单击“检索”和“高级检索”页面上的检索辅助工具 图标可查看所有可用的德温特分类代码。
打印此文件此文件可打印出约 30页。
在此页上查找使用浏览器的检索/查找功能，在此文件中检索文本。
化学 (A - M)单击一个专业可查看其分类代码的列表。
z A —聚合物和塑料z B —医药z C —农业化学品z D —食品、清洁剂、水处理和生物工艺学z E —常规化学品z F —纺织和造纸z G —印刷、涂料、摄影z H —石油z J —化学工程z K —核能利用、化学爆破和防爆z L —耐火材料、陶瓷、水泥和电化学z M —冶金学部分 A：聚合物和塑料下表的第一栏中为德温特分类代码。
A1 ADDITION AND NATURAL POLYMERSA11Polysaccharides; natural rubber; other natural polymers (only a restricted range of (modified) natural polymers are included.Thus starch would be excluded, but chemically modified starch included).A12Of di-and higher olefins; acetylenics; nitroso compounds.A13Of aromatic mono-olefins; including polystyrene.A14Of other substituted mono-olefins; including PVC, PTFE.A17Of unsubstituted aliphatic mono-olefins; including polyethylene.A18Addition polymers in general.A2 CONDENSATION POLYMERSA21Epoxides; aminoplasts; phenoplasts.A23Polyamides; polyesters.(including polycarbonates, polyesteramides); alkyds; other unsaturated polymers.A25Polyurethanes; polyethers.A26Other condensation polymers including silicone polymers and polymides (mineral silicates and similar materials would not usually appear in Section A).A28Condensation polymers in general.A3 PROCESSING: GENERAL ADDITIVES AND APPLICATIONSA31Preliminary processes.A32Polymer fabrication - such as moulding, extrusion, forming, laminating, spinning.A35Other processing and general - including vulcanisation, welding of plastics and adhesive processes.Testing.A41MONOMERS AND CONDENSANTSThese are also included in Section E.A60ADDITIVES AND COMPOUNDING AGENTSIf the usage is very restricted it may be classified under the individual polymer or process involved.A8/9APPLICATIONSA81Adhesives and binders - including chipboard.A82Coatings, impregnations, polishes - excluding textile finishing.A83Clothing, footwear.A84Household and office fittings - including carpets and carbon paper.A85Electrical applications.A86Fancy goods, games, sports, toys.A87Textile auxiliaries.A88Mechanical engineering and tools eg valves, gears and conveyor belts.A89Photographic, laboratory equipment, optical - including electrophotographic, thermographic uses.A91Ion-exchange resins, polyelectrolytes.A92Packaging and containers - including ropes and nets.A93Roads, building, construction flooring.A94Semi-finished materials - fibres, films, foams.A95Transport - including vehicle parts, tyres and armaments.A96Medical, dental, veterinary, cosmetic.A97Miscellaneous goods not specified elsewhere - including papermaking, gramophone records, detergents, food and oil well applications.部分 B：医药下表的第一栏中为德温特分类代码。
B01Steroids - including systems containing carbocyclic and/or heterocyclic rings fused onto the basic steroidal ring structure.B02Fused ring heterocyclics.B03Other heterocyclics.B04Natural products and polymers.Including testing of body fluids (other than blood typing or cell counting), pharmaceuticals or veterinary compounds of unknown structure, testing of microorganisms for pathogenicity, testing of chemicals for mutagenicity or human toxicity and fermentative production of DNA or RNA.General compositions.B05Other organics - aromatics, aliphatic, organo-metallics, compounds whose substituents vary such that they would be classified in several of B01 - B05.B06Inorganics - including fluorides for toothpastes etc.B07General - tablets, dispensers, catheters (excluding drainage and angioplasty), encapsulation etc, but not systems for administration of blood or saline or IV feeding etc.部分 C：农业化学品下表的第一栏中为德温特分类代码。
C01Organophosphorus; organometallic - ie compounds containing other than H, C, N, O, S and halogen.C02Heterocyclic.C03Other organic compounds, inorganic compounds and multi-component mixtures.Polymers and proteins.C04Fertilisers - including urea and phosphoric acid production.Also soil modifiers and plant growth media.Chemical aspects of compost production.C05Biological control - excluding veterinary medicine, but including use of microorganisms, predators and natural products.C06Biotechnology - including plant genetics and veterinary vaccines.C07Apparatus, formulation, general - including veterinary syringes, general formulations where the active compound is not central to the invention (for example, wettable powders) and analysis.部分 D：食品、清洁剂、水处理和生物工艺学下表的第一栏中为德温特分类代码。