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U.S. PATENT AND TRADEMARK OFFICE
Electronic Information Products Division
Patent Technology Monitoring Team (PTMT)

Patenting By Geographic Region (State and Country),
Breakout By Technology Class

Count of 1963 - 2006 Utility Patent Grants,
By Calendar Year of Grant

- Explanation of Data -

Rank Ordered Listing of Technology Classes Receiving 1 or More Utility Patents During the Period
Originating From

DISTRICT OF COLUMBIA

( patent origin is determined by the residence of the first-named inventor )
( technology class is determined by the primary classification assigned to the patent- see 'Explanation of Data' )

The following table displays technology classes and counts of associated patents, as distributed by the year of patent grant.
Class Class Title 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 Total
424 Drug, Bio-Affecting and Body Treating Compositions (includes Class 514) 1 2 1 1 1 0 2 2 0 0 0 0 0 0 1 1 2 1 1 0 2 1 0 4 1 1 1 2 6 3 6 4 5 3 6 14 6 4 9 4 4 1 3 4 110
073 Measuring and Testing 6 2 8 7 8 10 9 6 8 3 1 0 0 1 2 0 2 1 2 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 82
250 Radiant Energy 6 1 4 0 5 2 15 6 7 3 0 1 1 0 3 1 0 0 1 0 1 1 0 1 2 2 4 1 1 0 2 1 1 1 1 0 0 2 1 0 0 0 1 1 80
435 Chemistry: Molecular Biology and Microbiology 0 0 0 0 3 0 2 1 0 0 0 0 1 2 1 0 0 0 0 0 0 1 1 1 1 1 2 1 1 0 3 4 5 2 4 5 6 3 3 7 3 6 5 3 78
128 Surgery (includes Class 600) 2 2 0 0 2 2 1 4 3 3 1 0 1 0 0 0 1 3 3 0 0 0 1 0 1 2 0 2 4 5 3 3 1 2 3 2 2 1 1 1 4 2 4 4 76
342 Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation) 3 7 5 7 8 4 2 2 6 2 2 6 2 3 0 2 0 0 0 3 0 0 0 0 0 0 0 0 2 0 0 0 1 2 0 1 0 0 1 0 1 1 1 2 76
340 Communications: Electrical 3 1 1 5 4 2 2 6 5 0 3 1 1 6 0 1 1 2 0 0 0 1 0 0 1 1 2 1 1 0 0 1 2 0 0 0 0 1 2 2 1 2 1 3 66
532 Organic Compounds (includes Classes 532-570) 1 1 0 2 2 5 8 3 3 4 4 4 1 0 2 1 0 0 1 0 1 0 0 2 0 1 2 1 1 3 0 0 2 1 1 0 0 1 1 1 2 1 1 0 64
060 Power Plants 2 7 4 2 9 1 1 2 5 4 1 1 2 0 1 1 0 1 0 2 1 0 0 1 1 2 1 0 1 0 0 0 0 0 0 0 0 1 0 1 0 1 0 0 56
244 Aeronautics and Astronautics 4 2 5 5 8 2 4 3 5 2 0 0 0 1 1 0 0 0 1 1 0 0 1 0 0 0 0 0 0 1 0 0 0 1 1 0 2 1 1 2 0 1 0 0 55
102 Ammunition and Explosives 5 7 3 1 1 2 1 2 0 1 2 3 7 4 1 3 3 5 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 54
114 Ships 7 7 1 3 5 3 2 3 0 0 3 0 2 0 0 0 0 3 2 2 0 0 1 1 2 0 0 1 0 0 1 0 0 1 0 0 1 0 0 0 0 0 2 1 54
356 Optics: Measuring and Testing 2 0 3 3 3 1 0 5 7 0 2 4 1 0 0 1 1 0 1 0 1 1 1 0 3 0 1 0 1 0 0 0 0 0 0 0 0 3 0 2 1 1 0 0 49
324 Electricity: Measuring and Testing 1 5 5 4 7 2 4 4 5 1 1 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 1 0 1 45
343 Communications: Radio Wave Antennas 1 1 4 0 4 3 1 7 5 2 1 2 1 1 1 2 1 0 1 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 0 2 1 0 1 0 0 0 0 0 45
052 Static Structures (e.g., Buildings) 2 1 4 4 4 2 2 0 4 2 1 2 1 0 0 1 1 0 0 0 0 0 0 0 2 1 0 2 0 0 0 1 1 2 0 2 0 1 0 0 0 1 0 0 44
327 Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems 2 0 2 5 7 4 2 8 9 0 0 1 0 1 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 44
520 Synthetic Resins or Natural Rubbers (includes Classes 520-528) 0 0 5 2 0 2 2 9 3 1 0 0 1 1 0 2 0 0 0 0 0 1 2 0 0 2 0 2 3 2 0 0 0 1 1 0 0 0 0 0 0 0 1 0 43
137 Fluid Handling 1 3 3 2 6 3 4 3 4 1 1 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 35
455 Telecommunications 1 1 0 3 2 0 1 0 1 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 5 1 0 4 1 3 2 4 1 34
604 Surgery (Medicators and Receptors) 0 0 1 1 0 2 3 2 2 1 0 1 0 1 2 1 0 0 1 0 0 0 0 0 0 0 0 3 4 1 3 2 0 0 0 0 0 0 2 1 0 0 0 0 34
359 Optics: Systems and Elements 0 0 2 1 1 0 1 5 8 1 0 0 0 0 0 0 1 0 1 0 0 0 1 1 2 0 1 0 0 0 1 0 0 0 0 0 0 1 0 2 0 2 0 1 33
379 Telephonic Communications 0 0 1 0 1 0 1 1 1 0 0 0 0 1 0 1 0 0 0 0 0 0 1 0 0 0 5 1 1 0 0 1 1 0 3 2 0 0 1 0 2 4 1 3 33
705 DP: Financial, Business Practice, Management, or Cost/Price Determination (Data Processing) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 2 2 0 0 0 1 2 6 3 1 1 2 3 8 33
606 Surgery (instruments) 0 2 2 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 0 0 1 0 0 1 0 2 3 2 0 5 1 4 2 1 0 1 1 0 0 32
084 Music 0 0 3 6 1 2 0 1 1 0 1 0 1 1 0 0 0 0 0 0 0 2 2 0 0 1 1 1 0 1 0 0 1 0 0 0 1 1 1 0 1 0 0 0 30
126 Stoves and Furnaces 0 2 0 1 3 2 0 0 0 0 0 0 1 2 1 2 2 1 2 3 4 0 0 0 1 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 29
204 Chemistry: Electrical and Wave Energy 0 0 2 2 2 0 0 4 0 2 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 0 1 2 1 5 0 1 1 0 29
235 Registers (e.g., cash registers, calculators, devices for counting movements of devices, etc.) 1 1 2 4 3 1 2 2 1 0 0 0 0 1 1 1 0 1 1 0 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 27
248 Supports (e.g., for holding articles, etc.) 0 1 1 2 2 2 3 2 2 1 0 0 2 1 0 0 0 0 0 0 0 0 0 0 2 1 0 0 1 2 0 0 0 1 0 0 0 0 0 0 0 1 0 0 27
434 Education and Demonstration 1 2 4 0 3 1 0 1 1 0 2 0 0 0 1 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 1 1 0 1 0 0 2 1 27
206 Special Receptacle or Package 1 1 2 2 3 0 2 1 0 0 0 0 2 0 1 2 0 0 1 1 0 0 0 0 0 0 2 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 26
333 Wave Transmission Lines and Networks 2 0 2 0 4 2 4 1 3 2 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 26
348 Television 0 0 1 1 0 1 3 5 3 2 1 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 2 0 0 0 0 1 0 2 0 1 0 0 0 0 1 0 26
210 Liquid Purification or Separation 0 1 0 1 3 0 0 1 1 0 0 0 2 0 0 0 0 0 1 1 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 1 4 2 3 25
062 Refrigeration 0 1 2 3 0 1 2 1 4 1 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 0 0 0 0 0 1 1 0 0 0 1 1 0 24
310 Electrical Generator or Motor Structure 0 1 2 0 2 1 4 1 3 4 1 0 0 0 0 1 0 0 0 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 24
428 Stock Material or Miscellaneous Articles 0 1 1 2 1 0 1 1 2 0 0 0 2 0 2 0 1 0 1 1 0 0 1 0 0 1 0 0 0 1 0 0 1 0 0 0 2 0 0 0 0 0 0 1 23
002 Apparel 2 0 1 0 1 1 0 0 1 0 1 0 0 0 1 1 0 0 1 0 1 0 2 1 3 0 0 0 1 0 1 0 0 0 0 1 0 0 1 0 0 1 0 0 22
330 Amplifiers 1 2 0 2 2 1 3 1 4 1 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22
426 Food or Edible Material: Processes, Compositions, and Products 6 1 2 0 1 2 1 1 1 1 0 1 0 0 0 0 0 0 0 0 0 1 2 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 22
273 Amusement Devices: Games 0 0 0 0 0 0 0 3 0 1 1 1 1 1 0 0 0 1 0 0 1 0 1 0 0 0 0 2 1 0 1 2 2 1 1 0 0 0 0 0 0 0 0 0 21
280 Land Vehicles 0 0 0 0 0 0 0 1 3 2 2 1 0 0 0 0 1 0 0 1 0 2 0 0 0 0 0 1 2 1 0 0 0 0 0 1 1 0 1 0 0 0 1 0 21
136 Batteries: Thermoelectric and Photoelectric 0 0 0 0 1 1 3 4 3 0 0 0 0 1 0 1 1 0 0 1 2 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 20
367 Communications, Electrical: Acoustic Wave Systems and Devices 2 2 3 0 3 1 0 2 1 0 2 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 20
380 Cryptography 0 1 0 0 0 1 0 1 0 0 0 0 0 0 0 0 6 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 2 2 0 0 0 0 2 20
005 Beds 1 0 0 0 0 1 0 0 0 2 0 2 0 0 0 0 1 0 0 0 0 1 0 0 0 1 0 1 0 0 0 0 1 1 2 0 0 1 2 0 0 1 0 1 19
033 Geometrical Instruments 2 1 2 3 0 1 1 5 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 19
220 Receptacles 2 4 1 1 0 2 2 1 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 1 0 1 0 0 0 0 0 0 0 0 0 19
385 Optical Waveguides 0 0 0 0 0 0 0 0 0 0 0 0 3 4 1 0 2 1 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 1 1 0 2 1 0 19
422 Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing 2 0 0 0 0 0 1 1 3 0 0 1 0 0 0 0 0 0 2 0 0 0 0 1 0 2 0 0 1 1 0 0 1 0 0 1 1 0 0 0 1 0 0 0 19
089 Ordnance 4 6 2 0 0 1 0 0 0 1 0 0 2 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 18
156 Adhesive Bonding and Miscellaneous Chemical Manufacture 1 0 1 0 1 1 1 3 1 2 0 1 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 1 0 0 0 0 18
219 Electric Heating 0 1 0 0 1 0 5 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 1 0 0 3 0 0 0 0 2 0 0 0 18
361 Electricity: Electrical Systems and Devices 1 1 1 0 1 3 3 1 5 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 18
099 Foods and Beverages: Apparatus 0 1 1 0 0 2 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 2 0 0 0 3 0 3 1 0 0 1 0 0 0 0 17
119 Animal Husbandry 2 1 0 0 1 1 1 0 1 0 0 0 1 0 0 2 0 0 0 1 0 0 0 0 0 0 0 1 0 2 1 0 1 0 0 0 0 0 0 0 1 0 0 0 17
222 Dispensing (apparatus and process) 0 3 1 1 2 0 3 0 0 0 2 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 17
375 Pulse or Digital Communications 0 1 0 0 1 1 0 1 2 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2 0 0 0 2 3 2 17
405 Hydraulic and Earth Engineering 0 1 0 1 0 0 2 0 1 1 0 0 0 0 0 0 2 1 0 0 0 1 1 0 1 0 0 0 0 0 1 1 0 1 1 0 0 1 0 0 0 0 0 0 17
436 Chemistry: Analytical and Immunological Testing 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 2 1 0 2 1 0 0 0 1 0 0 1 2 0 0 1 1 1 0 0 0 1 1 0 0 0 17
708 Arithmetic Processing and Calculating (Electrical Computers) 0 2 1 0 1 0 2 2 5 2 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17
074 Machine Element or Mechanism 1 1 1 2 1 1 0 0 3 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 2 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 16
123 Internal-Combustion Engines 0 0 1 1 0 0 0 0 0 1 0 0 0 1 2 3 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 1 2 0 0 0 0 16
165 Heat Exchange 0 1 2 2 2 1 0 0 2 0 0 2 0 2 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 16
205 Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions 0 0 0 1 2 3 3 1 2 0 0 1 1 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 16
315 Electric Lamp and Discharge Devices: Systems 1 0 0 2 1 1 2 0 1 2 0 2 0 0 0 0 0 1 0 0 0 0 0 1 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 16
331 Oscillators 1 1 1 4 2 0 2 0 4 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 16
372 Coherent Light Generators 0 0 0 1 1 0 1 2 4 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 2 0 2 0 0 0 0 0 16
473 Games Using Tangible Projectile 0 1 0 0 0 1 0 0 1 1 0 2 0 2 0 0 0 1 0 0 0 0 1 0 1 0 0 1 0 0 0 0 0 0 0 0 0 2 0 1 0 1 0 0 16
482 Exercise Devices 1 0 1 0 0 0 1 0 0 0 1 1 1 0 0 0 0 1 2 0 0 0 2 0 1 0 0 0 0 1 0 1 0 0 0 0 1 0 0 0 0 1 0 0 16
004 Baths, Closets, Sinks, and Spittoons 1 0 0 0 1 0 0 1 1 0 0 1 0 3 1 0 1 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 2 0 0 15
200 Electricity: Circuit Makers and Breakers 0 2 1 2 1 1 1 1 1 1 1 0 0 0 0 0 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15
211 Supports: Racks 0 1 4 1 2 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 1 0 1 0 0 1 0 0 15
224 Package and Article Carriers 0 1 0 0 1 0 0 1 0 0 0 0 0 0 1 0 0 1 2 0 0 0 0 0 0 0 2 0 0 0 2 1 1 0 0 2 0 0 0 0 0 0 0 0 15
239 Fluid Sprinkling, Spraying, and Diffusing 0 1 1 0 2 0 2 2 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 15
294 Handling: Hand and Hoist-Line Implements 0 0 1 1 0 1 1 1 1 0 0 1 2 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 1 0 0 0 0 1 0 0 0 1 1 0 0 0 15
427 Coating Processes 1 0 0 2 0 0 4 1 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 0 1 0 0 0 0 1 0 0