Derwent World Patents Index – CPI Manual Codes

Category: Documentation

Topic: Commands & Functionality

Level: Advanced

Language: English

Derwent World Patents Index – CPI Manual Codes

STN User Documenation

Derwent Manual Codes have been developed over a period of more than 50 years, having been first introduced in 1963 when they were applied to patent references of the Farmdoc Service. Subsequently, this service has been renamed Section B and incorporated into the Chemical Patents Index (CPI).