NUMBER OF RECORDS
Numbers of records in Derwent World Patents Index
Derwent World Patents Index now covers more than 18.63 million inventions (Basic Records/patent families) detailed in over 40.64 million patent documents.
Breakdown by subject area for 22 December 2009 (update 200982):
|
Chemical Section | ||
|
Section A |
Polymers and Plastics |
2,582,313 |
|
Section B |
Pharmaceuticals |
1,008,986 |
|
Section C |
Agricultural Chemicals |
275,595 |
|
Section D |
Food, Detergents, Water Treatment & Biotech. |
1,269,165 |
|
Section E |
General Chemicals |
971,978 |
|
Section F |
Textiles and Paper-Making |
552,639 |
|
Section G |
Printing, Coating and Photographic |
600,303 |
|
Section H |
Petroleum |
337,447 |
|
Section J |
Chemical Engineering |
652,521 |
|
Section K |
Nucleonics, Explosives and Protection |
142,928 |
|
Section L |
Refractories, Ceramics, Cement, Electro(in)org. |
1,470,172 |
|
Section M |
Metallurgy |
908,631 |
|
Engineering Section | ||
|
Section P |
General |
5,307,780 |
|
Section Q |
Mechanical |
4,520,085 |
|
Electronic & Electrical Sections | ||
|
Section S |
Instrumentation, Measuring and Testing |
1,911,703 |
|
Section T |
Computing and Control |
2,838,394 |
|
Section U |
Semiconductors and Electronic Circuitry |
2,111,316 |
|
Section V |
Electronic Components |
1,649,929 |
|
Section W |
Communications |
2,559,382 |
|
Section X |
Electric Power Engineering |
2,514,896 |
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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