Connecticut State Library with state seal

Patent Codes

01 Firearms

02 Metal forming

03 Woodworking

04 Textile processing

05 Steam power

06 Railroad

07 Nautical

08 Clothing

09 Agriculture

10 Hand tools

11 Leather

12 Rubber

13 Musical

14 Medical/health

15 Food processing

16 Finance/currency

17 Timepieces

18 Heating devices

19 Lighting devices

20 Furniture

21 Household items

22 Hardware fixtures

23 Milling

24 Stone/brick/concrete

25 Carriages/vehicles

26 Chemicals

27 Pumps/hydraulics

28 Paper/printing

29 Scientific instruments

30 Ivory

31 Military Equipment

32 Sewing machines

33 Toys/amusements

34 Harness

35 Photographic

36 Glass

37 Cutlery & tableware

38 Electrical

39 Telephone

40 Fire escape/fire fighting

41 Architectural

42 Educational supplies

43 Fine arts

44 Air compressors