You can use Google Patent Search to conduct free patent searches. It contains more than 87 million patents from 17 patent offices. Added to that, its sleek UI and some functionalities that help you find a prior art in non-patent literature makes it a go to source to conduct a free patent search.
Type patents.google.com in the address bar of your browser and you are all set to search. Now you should know that we can divide Google Patent Search into two categories: Simple Search and Advanced Search.
Google Patent Search – Basic
As the name suggest, simple search is similar to normal Google search. You enter a keyword – I inserted 'Indoor Position System' – and you get results:
There is a lot of information in the above screenshot which could be critical for your patent search. For example, consider the first result Indoor positioning systems and wireless fingerprints.
Here is what this result tells you:
Title: Indoor positioning systems and wireless fingerprints
Abstract: An indoor positioning system and method that correlates map
locations to respective wireless access point (AP) fingerprints,
and wherein each
Publication Number: US9301100
Filing Date: 20 Jul 2015 Date of Issue: 29 Mar 2016
Inventors: Krishnam Raju Jampani
Assignee: Blackberry Limited
If you click on the result, you’ll get all this information tabulated on the RHS of the UI. Then why did I bother mentioning all this? It’s because opening all the results to get this info is not a good idea. You must get key info there and then on the search results.
Also, you can utilize the below Boolean search operators to get a desire result by running an advanced key string in the search box.
Also I advise you to go through this article that explains how to use different functionalities and operators of this tool with examples: 7 Tricks to make most out of Google Patent Search - GreyB . This will for sure be of a help to you.
Google Patent Search: Advance
Type patents.google.com/advanced in the address bar for Google Advanced Patent search which, to some extent, is equivalent to Boolean operators used in the simple search. If you look at the below screenshot, you will find that you can search patents by setting multiple criteria like patent title, inventor name, keyword or by applying date restrictions, etc.
A word of Caution
One advice I would like to give you is that you shouldn’t be banking too much on Google patent search if you are an entrepreneur who is running a patent search on his own. Google patent search has some serious limitations.
Its database gets update pretty late and there are going to be patents – applications as well as granted – existing and you won’t be able to find them. This has happened a lot with me.
You can consider using Freepatentsonline.com also.