UTILITIES (Cooperative Patent Classification)
http://www.uspto.gov/web/patents/classification/cpc.html
DESIGNS (U.S. Patent Classification)
  D01 Edible products
  D02 Apparel and haberdashery
  D03 Travel goods and personal belongings
  D04 Brushware
  D05 Textile or paper yard goods; sheet material
  D06 Furnishings
  D07 Equipment for preparing or serving food or drink not elsewhere specified
  D08 Tools and hardware
  D09 Packages and containers for goods
  D10 Measuring, testing, or signalling instruments (1) (2)
  D11 Jewelry, symbolic insignia, and ornaments
  D12 Transportation
  D13 Equipment for production, distribution, or transformation of energy
  D14 Recording, communication, or information retrieval equipment
  D15 Machines not elsewhere specified
  D16 Photography and optical equipment
  D17 Musical instruments
  D18 Printing and office machinery
  D19 Office supplies; artists' and teachers' materials
  D20 Sales and advertising equipment
  D21 Games, toys, and sports goods
  D22 Arms, pyrotechnics, hunting and fishing equipment
  D23 Environmental heating and cooling; fluid handling and sanitary equipment
  D24 Medical and laboratory equipment
  D25 Building units and construction elements
  D26 Lighting
  D27 Tobacco and smokers' supplies
  D28 Cosmetic products and toilet articles
  D29 Equipment for safety, protection, and rescue (1)
  D30 Animal husbandry
  D32 Washing, cleaning, or drying machine
  D34 Material or article handling equipment
  D99 Miscellaneous
PLANTS (U.S. Patent Classification)
  PLT Plants