After you found the right Keywords it’s time narrow down your search!
This is for example important if you want to find the latest state of the art!
But also if you want to know if you want to check if you infringe a patent!
A Patent can only be in force for 20/21 years!
So for doing a good period search you need some facts about Patents! Here I listed some events for you! In the section Patent and IP basics you find further information about Patents!
Period Search advanced
It depends on why you are doing a patent search!
Is the legal status important? Then you should search for the Application date or the priority date!
For a state of the art search only the publication date matters!
If you want to file a opposition the date of grant matters!
Period Search example
Here you find some examples on how to do a patent search!