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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

MARYLAND

( 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' )

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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) 9 2 6 5 7 4 9 4 2 12 15 12 10 13 13 23 16 22 24 24 20 24 19 20 37 32 34 33 35 61 67 69 84 96 156 168 212 164 192 188 176 134 108 143 2504
435 Chemistry: Molecular Biology and Microbiology 2 3 5 0 1 4 7 3 5 6 7 4 5 6 6 9 4 9 7 8 12 12 13 18 27 25 37 28 37 65 56 54 66 103 120 177 202 164 170 202 159 161 140 140 2289
532 Organic Compounds (includes Classes 532-570) 25 23 20 23 31 32 35 23 28 26 15 26 38 28 21 13 10 15 6 13 15 16 24 17 25 18 18 13 15 20 31 25 24 19 26 19 28 17 27 31 26 40 19 28 992
342 Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation) 23 27 32 35 36 27 15 17 24 27 38 21 20 23 36 35 20 26 6 23 12 10 16 33 25 12 12 26 17 36 24 30 24 21 8 16 26 21 17 15 15 21 11 9 968
128 Surgery (includes Class 600) 2 3 5 3 8 4 7 6 11 15 5 16 14 15 15 7 11 14 6 12 6 12 8 14 17 9 36 22 33 15 24 28 30 22 30 32 25 41 42 43 43 22 29 18 780
073 Measuring and Testing 21 14 36 27 28 36 36 26 32 30 32 14 23 22 19 15 10 11 14 17 5 12 21 11 12 12 8 11 11 17 12 13 12 12 11 15 14 11 15 12 19 21 10 19 779
520 Synthetic Resins or Natural Rubbers (includes Classes 520-528) 10 17 29 17 32 19 16 29 29 33 24 18 24 18 15 14 13 10 15 13 26 20 23 15 7 12 13 10 11 11 17 21 15 33 19 11 21 7 11 11 17 10 5 3 744
102 Ammunition and Explosives 18 22 21 16 15 20 23 11 25 26 45 34 40 29 16 7 6 21 14 11 16 6 7 9 5 3 7 14 18 11 13 18 7 9 14 9 8 7 15 12 8 5 5 5 651
250 Radiant Energy 13 9 9 11 19 5 24 10 25 10 17 10 13 11 9 8 3 13 13 10 12 7 9 4 9 13 19 18 28 18 21 19 17 26 11 15 8 14 9 21 15 26 21 25 627
428 Stock Material or Miscellaneous Articles 4 4 7 4 6 6 13 13 12 14 14 11 11 7 9 13 2 8 6 7 8 6 11 9 6 5 7 17 14 18 20 20 12 14 15 25 19 17 18 23 13 11 12 12 503
324 Electricity: Measuring and Testing 4 7 4 19 10 13 22 14 16 23 10 7 10 12 10 14 3 12 9 6 5 8 8 7 2 9 10 9 9 12 10 12 11 17 5 7 12 14 13 16 12 14 9 16 472
356 Optics: Measuring and Testing 0 3 6 2 9 3 8 9 6 9 17 20 15 11 14 7 7 12 12 6 10 6 6 11 7 7 9 9 17 9 9 13 8 13 11 20 21 16 7 7 11 11 13 7 434
530 Chemistry: Natural Resins or Derivatives; Peptides or Proteins; Lignins or Reaction Products Thereof 0 0 0 0 1 0 1 1 0 1 0 0 1 1 0 2 1 3 0 1 4 0 1 2 4 4 5 7 8 11 16 17 9 18 20 25 42 25 25 27 36 22 30 48 419
340 Communications: Electrical 8 3 16 8 7 12 7 8 14 15 9 10 9 6 7 5 4 9 11 6 5 4 4 9 6 5 5 9 3 3 4 5 6 11 17 18 12 11 22 9 6 17 17 35 417
210 Liquid Purification or Separation 2 5 4 9 11 9 5 6 12 19 10 10 9 11 10 7 8 11 12 9 4 6 4 2 9 5 9 16 10 19 15 10 13 10 17 12 9 2 8 5 9 8 9 6 396
604 Surgery (Medicators and Receptors) 9 3 2 1 4 11 6 5 3 4 2 10 6 2 5 4 2 10 7 8 3 8 8 8 9 12 6 5 11 11 10 26 29 14 23 23 11 9 15 8 19 13 8 3 396
370 Multiplex Communications 1 0 2 2 4 3 4 10 2 5 5 9 6 7 4 4 3 4 4 13 5 1 7 4 5 5 5 6 2 7 6 10 5 13 15 25 14 13 19 19 16 29 35 35 393
244 Aeronautics and Astronautics 20 19 15 13 14 13 16 18 18 18 14 13 19 7 5 5 6 7 0 5 7 4 0 6 10 5 3 6 8 2 4 9 5 4 2 5 6 7 6 13 8 5 5 6 381
137 Fluid Handling 4 5 17 36 17 19 30 28 27 15 9 16 9 9 4 3 6 8 8 3 9 5 7 7 3 5 2 5 4 3 4 6 6 3 3 5 6 3 6 5 2 2 0 5 379
333 Wave Transmission Lines and Networks 7 5 17 16 15 12 8 7 22 9 8 12 10 8 13 7 9 10 17 9 9 2 5 9 15 3 7 4 6 9 7 8 3 2 3 3 7 4 2 5 15 13 5 9 376
327 Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems 16 16 25 21 18 15 26 23 40 21 18 14 8 11 3 7 8 3 7 3 2 4 6 1 6 3 2 2 3 7 0 2 2 1 3 5 1 4 0 2 4 3 2 1 369
455 Telecommunications 5 5 5 5 6 5 6 3 3 10 9 4 8 8 3 5 2 5 7 4 4 1 0 0 0 2 4 1 5 4 3 7 5 5 9 21 14 21 24 18 20 23 23 37 359
052 Static Structures (e.g., Buildings) 7 6 9 18 15 11 12 6 20 6 6 9 7 3 10 2 2 5 5 5 6 17 7 10 10 7 5 5 5 5 9 6 11 4 12 6 9 10 9 11 6 5 5 3 347
375 Pulse or Digital Communications 1 2 3 2 2 3 3 4 7 6 8 10 2 6 3 5 3 3 4 3 5 10 10 5 2 3 6 8 9 5 6 9 6 16 11 12 18 14 14 19 16 19 18 17 338
359 Optics: Systems and Elements 0 3 3 5 2 9 9 10 15 9 7 4 6 7 1 7 2 4 2 5 6 11 4 6 4 6 3 8 6 11 5 4 4 9 4 10 8 13 12 27 25 11 16 14 337
114 Ships 4 10 12 12 5 10 12 12 14 13 17 11 8 6 7 4 1 10 3 9 4 6 2 2 3 3 5 10 3 7 15 5 7 5 4 6 4 8 9 9 13 4 3 10 327
343 Communications: Radio Wave Antennas 3 6 10 6 5 7 8 11 10 6 9 13 10 11 9 9 5 5 4 5 5 1 6 4 3 7 3 9 2 4 7 8 6 5 3 8 11 5 3 14 12 9 18 9 314
606 Surgery (instruments) 0 1 1 1 0 1 5 4 2 3 2 4 4 2 1 2 0 1 1 3 4 4 7 7 1 3 6 3 8 12 9 16 8 26 29 34 28 16 10 12 7 6 10 5 309
423 Chemistry of Inorganic Compounds 1 7 5 4 14 22 9 11 11 11 10 9 7 13 8 10 8 6 13 12 2 7 8 3 3 3 5 6 10 2 6 5 8 5 6 3 5 3 3 1 3 2 3 5 298
029 Metal Working 5 8 9 11 11 10 10 7 9 10 17 13 13 2 4 10 7 4 3 3 3 3 4 8 7 10 6 9 3 2 5 2 4 1 4 9 4 3 8 2 4 8 6 13 294
436 Chemistry: Analytical and Immunological Testing 2 1 3 3 0 3 5 3 5 4 4 5 4 4 4 5 2 6 6 2 3 3 6 8 4 1 6 2 5 6 7 7 10 8 13 12 17 5 16 19 12 15 9 12 277
422 Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing 3 1 11 8 5 3 4 5 3 0 6 7 8 10 3 4 6 5 5 5 2 2 3 1 1 3 5 7 11 6 15 7 8 8 5 17 12 10 9 9 7 8 5 7 270
367 Communications, Electrical: Acoustic Wave Systems and Devices 4 6 8 10 4 8 3 8 4 4 5 6 10 8 9 9 3 10 9 3 4 3 4 3 9 3 3 15 14 8 9 11 12 7 7 1 1 1 4 2 3 4 1 6 266
385 Optical Waveguides 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 4 4 2 4 1 1 5 1 4 3 2 4 3 5 1 4 10 5 4 9 20 15 13 18 22 19 23 20 23 252
502 Catalyst, Solid Sorbent, or Support Therefor: Product or Process of Making 1 4 3 2 3 2 9 3 1 6 8 7 12 7 3 4 8 2 7 3 8 6 7 3 5 8 6 14 4 10 9 8 8 3 4 6 9 9 9 7 6 2 3 2 251
156 Adhesive Bonding and Miscellaneous Chemical Manufacture 4 2 3 6 8 4 8 10 12 8 10 5 3 4 4 7 5 3 12 10 8 8 4 4 4 4 2 3 3 3 8 5 7 4 7 8 10 7 6 2 4 5 2 4 250
427 Coating Processes 6 4 7 11 2 3 7 8 8 8 8 11 10 1 5 3 8 6 7 3 2 4 4 4 1 2 5 5 9 6 1 7 5 5 10 7 5 4 7 7 10 9 2 3 250
222 Dispensing (apparatus and process) 5 15 11 16 10 7 8 2 10 5 5 12 8 12 6 4 4 4 5 5 4 3 0 2 7 2 5 2 2 4 6 4 3 2 7 2 5 6 7 7 3 4 6 2 249
379 Telephonic Communications 0 1 0 0 1 1 3 1 2 4 3 6 3 3 5 4 3 2 1 2 3 1 1 5 4 2 2 3 7 3 3 6 15 19 14 15 10 10 7 11 9 13 18 20 246
252 Compositions 5 10 8 8 18 8 1 7 5 11 8 3 4 3 1 2 0 2 3 1 3 1 1 6 2 2 5 4 12 8 6 9 6 11 9 9 10 5 5 3 2 2 6 7 242
264 Plastic and Nonmetallic Article Shaping or Treating: Processes 7 3 8 8 12 6 8 7 9 8 4 9 5 11 3 7 2 5 9 5 3 7 4 2 0 3 0 5 5 5 11 7 6 3 5 7 3 6 3 3 6 2 2 8 242
382 Image Analysis 4 4 22 9 1 1 4 5 3 5 3 4 0 3 2 4 0 2 1 1 1 0 4 2 4 3 5 0 5 5 6 6 6 7 4 11 13 7 7 7 17 17 7 20 242
310 Electrical Generator or Motor Structure 2 4 9 2 8 5 17 7 8 8 7 6 7 4 1 4 8 3 2 3 5 4 3 2 3 2 4 5 4 5 6 3 3 6 4 5 2 5 6 5 6 11 12 13 239
106 Compositions: Coating or Plastic 5 0 3 7 1 7 10 3 6 0 6 15 15 6 9 5 8 5 6 4 6 4 3 1 1 4 5 2 6 5 3 7 4 7 6 12 5 3 5 6 9 4 1 3 233
473 Games Using Tangible Projectile 3 1 4 2 3 2 6 4 3 3 6 2 4 8 5 10 4 2 3 5 4 4 2 1 4 5 6 15 7 8 8 6 6 8 11 7 3 4 1 5 10 1 13 6 225
315 Electric Lamp and Discharge Devices: Systems 6 5 4 10 11 9 12 6 6 4 7 9 8 1 3 0 1 3 1 3 2 2 8 2 2 3 2 9 6 0 5 2 5 5 1 14 14 4 8 4 7 4 3 2 223
434 Education and Demonstration 13 5 6 4 7 6 9 8 12 5 5 10 4 5 5 1 1 4 2 5 1 1 5 2 1 4 3 2 3 3 9 4 8 5 3 2 4 4 7 3 9 14 5 4 223
089 Ordnance 7 14 11 10 10 1 6 5 4 5 8 3 4 4 7 5 2 3 2 3 4 3 3 3 5 1 5 9 10 1 5 6 6 1 6 4 9 2 5 6 8 3 0 3 222
062 Refrigeration 2 5 7 5 2 1 1 2 3 1 3 8 2 1 3 3 2 3 1 5 4 5 6 9 3 9 11 9 8 8 10 6 12 9 9 5 3 5 7 5 5 5 2 4 219
273 Amusement Devices: Games 4 2 2 4 2 2 3 5 10 3 2 9 6 5 7 3 12 6 2 6 5 3 8 5 4 4 6 9 8 7 3 11 6 2 3 3 5 5 7 5 6 3 2 2 217
257 Active Solid-State Devices (e.g., Transistors, Solid-State Diodes) 0 0 3 2 4 4 11 3 9 3 2 6 8 0 8 4 2 0 1 3 1 2 6 3 2 1 3 3 8 5 4 4 5 4 5 11 11 7 8 11 6 16 4 9 212
206 Special Receptacle or Package 1 5 3 15 5 1 4 5 6 1 7 3 4 4 5 2 3 3 10 4 8 4 1 2 5 4 9 4 7 3 3 8 3 4 5 5 7 14 2 6 2 5 5 2 209
426 Food or Edible Material: Processes, Compositions, and Products 3 6 5 1 5 4 5 8 5 9 7 3 5 4 3 1 3 3 11 5 4 5 3 3 3 5 4 3 2 0 5 8 4 5 6 6 10 9 15 5 4 3 0 0 208
083 Cutting 2 6 9 6 6 1 3 7 6 3 5 3 8 1 6 2 2 7 5 3 3 4 1 2 1 5 4 2 2 0 1 2 3 1 2 6 12 12 9 12 9 11 5 7 207
219 Electric Heating 0 5 6 3 3 5 8 6 10 9 6 7 4 1 5 3 2 4 2 4 5 8 5 7 7 7 12 6 4 4 5 2 2 8 1 7 3 3 2 4 4 6 2 0 207
060 Power Plants 4 6 12 10 14 5 6 7 3 5 5 4 4 5 4 1 3 3 6 3 3 7 3 3 3 4 4 2 4 3 5 3 6 4 2 0 1 0 6 8 7 6 6 2 202
361 Electricity: Electrical Systems and Devices 2 6 5 8 5 8 5 8 9 6 2 5 4 4 9 1 2 2 3 2 1 4 5 2 0 3 6 7 2 2 4 9 9 7 1 2 5 3 4 5 5 13 5 1 201
331 Oscillators 4 10 13 21 8 8 3 6 13 7 6 7 12 6 2 5 4 3 3 7 2 4 3 8 7 0 6 1 3 1 0 2 0 1 2 2 1 0 2 0 2 0 2 3 200
451 Abrading 6 12 5 14 10 13 8 5 11 9 11 8 2 2 7 1 3 1 0 0 2 3 3 3 5 2 2 5 0 5 6 3 1 2 0 1 4 5 3 4 2 2 3 4 198
149 Explosive and Thermic Compositions or Charges 4 9 3 1 2 4 5 2 5 9 14 7 11 9 7 5 1 5 5 6 10 5 3 0 3 2 4 5 7 2 5 0 2 1 0 1 5 3 5 5 6 2 3 1 194
482 Exercise Devices 0 1 0 0 1 0 1 3 1 0 0 0 0 0 1 4 4 2 6 1 4 5 3 2 7 3 5 7 11 18 14 17 9 14 5 4 7 11 8 4 3 3 0 5 194
239 Fluid Sprinkling, Spraying, and Diffusing 5 3 6 5 3 4 5 7 10 3 8 5 8 2 2 4 7 7 3 3 1 1 1 4 5 1 1 1 7 2 7 3 0 4 4 4 6 7 6 5 5 7 5 5 192
030 Cutlery 8 4 6 7 3 4 3 3 4 4 2 5 8 7 3 7 2 10 4 3 2 2 2 4 3 4 1 4 4 2 4 1 0 3 1 8 5 5 10 6 6 7 2 7 190
248 Supports (e.g., for holding articles, etc.) 3 4 8 8 10 10 9 5 3 1 2 3 4 1 3 4 5 3 2 2 3 1 4 0 3 1 6 3 3 12 5 5 2 2 7 7 2 6 4 12 4 1 5 2 190
330 Amplifiers 6 8 10 11 10 19 17 4 8 7 0 6 2 8 5 5 5 3 4 1 3 6 3 1 0 3 0 6 3 3 0 1 2 2 2 1 3 2 2 1 3 3 1 0 190
438 Semiconductor Device Manufacturing: Process 0 1 3 0 1 3 5 1 2 2 0 3 6 5 2 5 4 4 3 7 1 3 5 2 6 1 4 4 3 2 5 7 2 4 3 6 2 10 11 8 20 10 9 5 190
429 Chemistry: Electrical Current Producing Apparatus, Product, and Process 0 0 8 3 8 6 9 2 6 1 3 3 5 7 8 7 2 5 3 5 2 2 0 3 6 8 4 2 0 2 4 6 3 5 5 8 3 3 5 5 9 3 5 4 188
398 Optical Communications 0 1 3 0 2 1 1 1 0 1 3 0 0 1 0 3 2 1 1 2 2 0 1 1 1 1 2 2 2 1 2 3 2 4 9 9 10 11 19 14 17 7 17 25 185
280 Land Vehicles 3 2 8 3 4 1 5 6 2 7 3 2 7 3 2 2 2 2 2 0 3 7 3 3 2 2 4 5 5 10 7 4 6 3 4 4 9 6 4 4 8 1 2 8 180
002 Apparel 6 5 5 6 1 6 2 3 4 4 2 3 4 1 3 2 0 3 2 1 2 1 3 0 4 3 4 4 4 3 5 2 4 4 7 8 8 5 11 6 6 3 5 9 174
015 Brushing, Scrubbing, and General Cleaning 10 7 4 5 4 5 2 3 4 4 2 2 2 3 4 2 2 2 6 3 5 4 2 1 1 3 7 6 5 3 3 8 3 6 6 4 3 8 2 4 1 3 4 5 173
439 Electrical Connectors 3 2 6 7 12 7 3 10 7 3 7 2 2 5 9 1 3 3 2 4 2 7 3 3 2 3 6 3 3 4 5 0 1 5 1 1 3 0 4 4 0 4 4 5 171
372 Coherent Light Generators 0 0 2 1 2 7 4 5 8 5 6 5 6 6 2 5 3 5 5 0 3 2 7 7 2 1 3 4 5 4 1 6 3 3 2 5 1 5 1 6 4 5 5 2 164
702 DP: Measuring, Calibrating, or Testing (Data Processing) 0 0 0 0 1 1 0 0 2 0 1 0 2 0 1 0 3 2 2 2 4 2 2 2 5 1 3 5 1 3 6 2 5 2 8 7 6 8 8 11 16 12 12 14 162
705 DP: Financial, Business Practice, Management, or Cost/Price Determination (Data Processing) 0 0 0 0 1 1 0 0 0 0 0 1 0 0 1 0 0 0 0 1 1 0 1 2 1 0 1 2 3 1 7 1 3 3 3 6 15 14 12 10 15 10 12 34 162
348 Television 2 0 3 2 1 0 1 6 8 7 7 8 6 5 6 1 1 6 5 2 4 4 4 1 7 4 4 4 1 4 3 7 5 1 5 8 3 1 3 1 2 2 3 1 159
005 Beds 4 0 2 4 3 0 2 1 3 2 1 2 2 2 3 3 6 3 3 4 1 2 8 3 8 6 5 3 2 10 6 2 3 3 5 2 5 5 5 4 5 4 6 5 158
414 Material or Article Handling 6 4 9 12 10 4 10 7 9 2 6 8 6 8 3 0 1 3 1 1 1 6 3 2 4 2 0 1 3 2 2 1 4 0 2 0 0 3 0 1 5 1 4