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How to find patents 
Search the united states patent and trademark office website. 
The website for the united states government's patent office lets you search through its patents as far back as 1790. 
You can access the search engine for the u.s. patent and trademark office at uspto. Gov and then follow the links to " patents " and " patent search.
" Search for other individual countries' official patent offices. If you are interested in searching for patents in a particular country other than the united states, you can search online for the patent office of that country.