How to research 3d printing patents

After a guide on how to copyright your 3d printed work here are few sources that shows you all the steps needed for patent research if you want to apply for your patent or protect your work from being patented by someone else (like a big corporation).
They cover mostly US Patents and Trademark Office but remember that patenting is big international issue.

Source, full size image and more info:

http://www.entrepreneur.com/article/244693

Here is the official guide by USPTO:

http://www.uspto.gov/products/library/ptdl/services/7_Step_US_Patent_Search_Strategy_Guide_2014.pdf

Here is video showing the main steps: