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Core Resources

Google Advanced Patent Search (PDFs available for free)
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Patent Tutorial
Free Patents Online
U.S. Patents and Patent Applications — Full-Text Images (1790 to date)
U.S. Patent Number Search (full-text)
Order Certified Copies of Patents (fee-based service)
Lens.org
Search engine for US and international patents

Google Patent Search

Patent Relationship Visualization

PatentsView (from the USPTO)
PatentsView is a visualization, data dissemination, and analysis platform that focuses on intellectual property (IP) data.

Historical Patents