Report:Delphion/Data Coverage/Patent Coverage/Full Text Coverage/United States (US)

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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.

United States

Full text and images of US published applications are covered from March 2001. As with all collections, once published, the application is not removed from the database even if it becomes an issued patent.

Delphion contains searchable full text for US granted patents from 1971 and an active collection of images from 1974. The system also maintains a backfile of bibliographic information and patent images back to the 1790s. Notably, Delphion does not contain full-text records for US patents from before the 1970s - even the bibliographic information is not likely to contain a searchable title or abstract. This is a disadvantage for those users wishing to keyword search for mechanical subject matter, a field that has existed for centuries. Bibliographic records for these documents do include US classifications, so classification search might still retrieve these records.

Some representative patent drawing thumbnail images are present for this collection (to read more about thumbnail drawing images, see the Viewing Patent Drawings section of this article).

The US collection is the only collection for which Delphion maintains citation data.


editors note iconEditor's Note:

Although it is not uncommon for full text search providers to lack this valuable collection, searchable pre-1970s OCR full-text records for US patents are available through several other subscription services, including Questel QPAT, MicroPatent PatentWeb, Thomson Innovation, or the free search tool Google Patent Search. (Earliest dates of coverage vary across these providers).

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