Generally speaking companies "extend" their patent by making a slight tweak to get a new patent. But that doesn't stop their old patent from expiring. And the old formula from becoming open to a generic.
So why aren't there generic versions of old formulations? Who cares if it doesn't have the latest tweak? The complain about such tweaks is that their minor and unimportant. Meaning the previous version should be just fine.
So why aren't there generic versions of old formulations? Who cares if it doesn't have the latest tweak? The complain about such tweaks is that their minor and unimportant. Meaning the previous version should be just fine.