NUMBER OF RECORDS
Numbers of records in Derwent World Patents Index
Derwent World Patents Index now covers more than 18.25 million inventions (Basic Records/patent families) detailed in over 39.7 million patent documents.
Breakdown by subject area for 15 September 2009 (update 200959):
|
Chemical Section | ||
|
Section A |
Polymers and Plastics |
2,527,700 |
|
Section B |
Pharmaceuticals |
987,720 |
|
Section C |
Agricultural Chemicals |
271,822 |
|
Section D |
Food, Detergents, Water Treatment & Biotech. |
1,242,922 |
|
Section E |
General Chemicals |
961,114 |
|
Section F |
Textiles and Paper-Making |
545,102 |
|
Section G |
Printing, Coating and Photographic |
594,414 |
|
Section H |
Petroleum |
332,374 |
|
Section J |
Chemical Engineering |
641,857 |
|
Section K |
Nucleonics, Explosives and Protection |
142,091 |
|
Section L |
Refractories, Ceramics, Cement, Electro(in)org. |
1,448,421 |
|
Section M |
Metallurgy |
899,486 |
|
Engineering Section | ||
|
Section P |
General |
5,194,646 |
|
Section Q |
Mechanical |
4,428,589 |
|
Electronic & Electrical Sections | ||
|
Section S |
Instrumentation, Measuring and Testing |
1,873,237 |
|
Section T |
Computing and Control |
2,759,728 |
|
Section U |
Semiconductors and Electronic Circuitry |
2,071,376 |
|
Section V |
Electronic Components |
1,616,233 |
|
Section W |
Communications |
2,503,440 |
|
Section X |
Electric Power Engineering |
2,450,227 |
Please note:
These figures are all based on the number of unique basic patent records. Equivalent patent document filings are added to these records to form a Derwent patent family.
Individual records may appear in a number of different sections, so the above numbers can not be added together to give the total number of records in DWPISM.
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