Quote:
Originally Posted by Proteus
How long has ecotech had the pm power heads. I though but can be very wrong. THat patents were limited to 10 years
|
20 years from the filing date and it looks like it was filed in 2010. Here's a link if you're curious:
https://www.google.com/patents/US819...ed=0CDkQ6AEwAA
Looks like they have a couple earlier patents too.