Derwent Patent Assignee/Company Codes
DWPI PATENT ASSIGNEE CODES
For each patent in DWPI, the patentee is assigned a 4-letter code. All patentees carried on the original source document are assigned codes, and the code is normally based on the name of the patentee. The Patent Assignee Codes formats are:
|DWPI on STN||DWPI on Thomson Innovation; DWPI on Dialog||DWPI on Questel; DWPI Abstract Products|
Approximately 21,000 companies which have more than 1000 patents in DWPI are regarded as 'standard' companies and assigned a unique four-letter code. These standard codes encompass known subsidiaries as well as the parent company, and so provide a valuable search tool for obtaining a complete set of DWPI records relating to an organisation as a whole. To find the standard patent assignee code for a company, use the Patent Assignee Codes Lookup Facility.
Latest Additions — The New Patent Assignee Code List shows the standard codes added to DWPI since the last edition of the user guide. The list is updated regularly to include the latest codes.
In the case of Mergers or Demergers of these ‘standard’ companies, the codes are applied in accordance with our guidelines.
Since 1970, 'non-standard' assignee codes have been assigned to companies and institutes that do not file a large number of patents. These codes are allocated using a set of simple rules and the list is growing continually. Non-standard company codes and Individual assignee codes are often not applied uniquely to a particular company/person, and so are of limited value for searching. In these cases a search of the assignee names will give a more precise retrieval.