Coverage: US, WIPO & European patents (USPTO back to 1790, WIPO & EPO back to 1978), US & European published patent applications, includes 'Find Prior Art' option to search multiple sources (Patents, Books, Scholar, web) and fine tune by inventor (People facet) as well as dates.
- Searches patents and applications at the same time.
- Prior art finder.
- Better for keyword searching; classification and date searching can be unreliable.
- OCR is problematic and not all patents are listed (in spite of there being no disclaimer).
- Pre-1976 patents are not reclassified, so classification won't have been updated as classifications evolve. Patents can be bought and sold and pre-1976 patents will only show the original assignee.