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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