Report:Delphion/Data Coverage/Patent Coverage/Bibliographic Coverage
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|DWPI on Delphion is no longer available, as of March 31, 2012. DWPI data is available on the Thomson Innovation platform.|
The EPO’s INPADOC database is searchable through Delphion. The applicable family data and legal status information is also associated with full text records in the database. Unlike some other databases which integrate INPADOC data into their full text records, Delphion treats INPADOC as a separate, searchable file. The INPADOC bibliographic file as loaded on Delphion does not allow users to select the United States (US), European Patent Office (EP), German (DE) or Japanese (JP) authorities for searching. This was likely done to prevent duplicate hits in a multi-file search, when the bibliographic file is searched alongside the full text data files.
Delphion also provides access to the Derwent World Patent Index (DWPI) file, also produced by parent company Thomson Reuters. In brief, the Derwent file is a collection of revised, value-added English language titles and abstracts given to patent documents by over 350 native-language speakers/subject matter experts who review patent documents and create English titles and abstracts to express the inventive concepts using industry-standard language. The experts also break down large INPADOC patent families, based on shared priorities, into smaller Derwent families, which are based on equivalent content. The file contains newly created Derwent titles and abstracts for over 22.5 million patent documents (or 13 million unique inventions) from over 40 different patenting authorities around the world, and approximately 1.5 million more are added every year.
Finally, Delphion also contains a bibliographic and image-only collection of about 17,000 Swiss (CH) patents. Most of these have a searchable French or German title but will not have a searchable abstract.
The DWPI file makes use of expert reviewers/interpreters using industry-standardized language: the ultimate goal is to create a file that can be searched confidently using keywords. Unfortunately, use of this file can make for very expensive searches – a single search in the file is $4, and it costs $6 per record to view the results. Because of this, many users choose to search the full-text and INPADOC collection, and leave the Derwent files for special occasions.
Despite the cost of a Derwent record, there is still a special advantage to searching non-Derwent records in Delphion: Derwent titles for any record can be displayed for free, as a perk of the system. These value-added titles can aid searching, especially if the searcher’s goal is to comprehend record content at-a-glance by scanning titles.
Although the Swiss bibliographic and image collection may have been useful to Delphion searchers at one time, it is probably mostly duplicative of the bibliographic information that can be found in INPADOC, and the images that are present in Delphion via the EPO's image database, making it a relatively unimportant feature of the system.