FreeFull-text Worldwide Patent Searching - Patent Lens

Patent lens provides following features:

# Quick search
# Structured search
# Expert Search
# Sequence search

Patent Lens Features:

# Zotero support added. Automatically add patent citations to Zotero reference manager (a FireFox plug-in).
# Australian Granted Patents are now searchable in full text, just as the US and European patents have been since last year. Read the press release: Australian Patents Now Under The Lens (info).
# Cost-free PDF downloads now available for all US patent documents (apps and grants), Australian and European patents. Available as a multipage PDF or a single page at a time, for faster browsing.
# Search result filters that retrieve US patents based on dates in force vs. expired
# Protein & DNA Sequence searches for US biological sciences patents and patent applications

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