ELI5: Explain Like I'm 5

Doctrine of equivalents

Do you remember playing with blocks and how you could build a tower using different shapes and sizes of blocks to make it look like one big tower? Well, the doctrine of equivalents is a little bit like building a tower using blocks.

In the world of grown-ups, when someone invents something new, they may want to protect it from others who might copy it. This is called a patent. A patent basically gives someone the exclusive right to make, sell or use their invention for a certain number of years.

But what if someone else creates something similar to the invention, but not exactly the same? This is where the doctrine of equivalents comes into play. It means that even if something is not exactly the same as the invention, it can still be considered infringing if it performs the same function and has basically the same result.

So, going back to our block tower, let's say someone decides to make a tower using different blocks than the ones you used, but the tower still looks the same and has the same number of blocks. This would be like the doctrine of equivalents, where something may not be exactly the same, but it still achieves the same goal.

So, in short, the doctrine of equivalents helps to protect inventors from others who might try to copy their invention using similar methods or materials.