Design patents are classified based upon function or intended use. (To learn more about the design patent classification system, check the USPTO’s Design Patent Classification page. U.S. Design patents are classified into 33 classes of subject matter:

D1 Edible Products
D2 Apparel and Haberdashery
D3 Travel Goods, Personal Belongings, and Storage or Carrying Articles
D4 Brushware
D5 Textile or Paper Yard Goods; Sheet Material
D6 Furnishings
D7 Equipment for Preparing or Serving Food or Drink Not Elsewhere Specified
D8 Tools and Hardware
D9 Packages and Containers for Goods
D10 Measuring, Testing or Signaling Instruments
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
D30 Animal Husbandry
D32 Washing, Cleaning or Drying Machines
D34 Material or Article Handling Equipment
D99 Miscellaneous