Report:Delphion/Search Interface/The Search Forms/Derwent Search

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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.

Derwent Searching

In addition to the search forms discussed in the earlier sections of this article, Unlimited and Premiere status users have access to the Derwent search option; due to the value-added nature of the data, these searches are always pay-per-use on Delphion regardless of subscription status. The three Derwent search interfaces are Derwent Number, Derwent Boolean and Derwent Advanced search forms.

Derwent Number is a straightforward interface that allows the user to search by publication number (the user must choose the desired country code by drop-down menu instead of typing it), or the Thomson-assigned accession number (the year portion of the number must be chosen by drop-down menu). A $6 charge is assessed per record displayed for all users.


The Derwent Number Search form.


editors note iconEditor's Note:

The need to choose the country and year via drop-down menu makes the Number Search form somewhat cumbersome, but it does eliminate the need for the user to remember the country's patent code when searching on a document number.


The Derwent Boolean interface is identical to the Boolean search interface: designed for novices, users can choose up to four discrete fields of search, and connect the terms by Boolean operators. A date limitation may be applied using publication date only (which is more restrictive than options for the non-Derwent Boolean interface).


The Derwent Boolean Search Form.


The Derwent Advanced interface has a similar design to the non-Derwent advanced form: it offers a query-input box at the top for “any field” queries or command-language text queries, and a search form underneath for field-specific searching.


The Derwent Advanced Search Form.


Field specific searching includes the following:

Inventor/Author:
Assignee: Assignees in the Derwent file can be searched by name, or by Derwent code. Derwent indexers rely on codes to replace assignee names, so that variations in the name do not disrupt efforts to search for them.
Derwent Title: This is a value-added title that has been written by a professional indexer to replace the original title. Although these are displayed for free for any Derwent or Non-Derwent record in Delphion, searching in this field can only be performed from a Derwent search form and does cost $4 a search, like any other Derwent search.
Title Terms: Title terms are taken from the Derwent Titles of each record, and placed into this special field, which then functions as a keyword indexing field for Derwent records.
Derwent Abstract: A value-added abstract. Derwent abstracts contain many discrete sections: Novelty, Description, Use, Advantage, Activity, Mechanism, Claims, and Description of Drawings. A search from the advanced search form can be directed to any one of these sections individually.
Manual Codes: Manual Codes make up a Derwent-created classification system. Codes are assigned to each record by a professional indexer. The Engineering and Electrical portions of the code system have been in use since 1974, while the Chemical portion was in use even before that time.
Derwent Class: Derwent Classes are the upper hierarchies that make up the Manual Code classification system. Searching in this field is broader than searching the manual codes.
IPC Class: IPC classes are assigned to individual records by the examiners from their country of issue. The IPC class in the Derwent search form will search the IPC Derwent fields, which consist of aggregated IPC data from each Derwent family member in the record.
Starting Accession Number: This is a unique identifier assigned to each Derwent family record when it is first created in the system.
Derwent Update: This number indicates at which Derwent Update the record was first uploaded into the database. Update numbers are identified by a four-digit year (the year of the update), followed by a two-digit serial number.
Publication Date: Searches by the publication date of any family member.
Application Date: Searches by the application date of any family member.
Priority Date: Searches by the priority date of any family member.
Priority: Searches for Derwent records using a priority document number.
Family: Find a Derwent family record by searching on an individual document number.
Designated State: Searches for Derwent records by designated state.


For detailed information on Derwent fields and data structures, please see the Derwent World Patents Index article for more information about this file.

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