NUMBER OF RECORDS
Numbers of records in Derwent World Patents Index
Derwent World Patents Index now covers more than 21.56 million inventions (Basic Records/patent families) detailed in over 47.1 million patent documents.
Breakdown by subject area for 31 December 2011 (update 201182):
|
Chemical Section | ||
|
Section A |
Polymers and Plastics |
3,018,549 |
|
Section B |
Pharmaceuticals |
1,158,551 |
|
Section C |
Agricultural Chemicals |
303,588 |
|
Section D |
Food, Detergents, Water Treatment & Biotech. |
1,462,175 |
|
Section E |
General Chemicals |
1,046,215 |
|
Section F |
Textiles and Paper-Making |
609,593 |
|
Section G |
Printing, Coating and Photographic |
640,748 |
|
Section H |
Petroleum |
377,385 |
|
Section J |
Chemical Engineering |
738,105 |
|
Section K |
Nucleonics, Explosives and Protection |
150,785 |
|
Section L |
Refractories, Ceramics, Cement, Electro(in)org. |
1,615,120 |
|
Section M |
Metallurgy |
983,002 |
|
Engineering Section | ||
|
Section P |
General |
6,183,458 |
|
Section Q |
Mechanical |
5,260,790 |
|
Electronic & Electrical Sections | ||
|
Section S |
Instrumentation, Measuring and Testing |
2,241,239 |
|
Section T |
Computing and Control |
3,381,196 |
|
Section U |
Semiconductors and Electronic Circuitry |
2,394,090 |
|
Section V |
Electronic Components |
1,893,845 |
|
Section W |
Communications |
2,943,605 |
|
Section X |
Electric Power Engineering |
3,031,652 |
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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