Patent and Invention Help Forum

When one invention is used in a second, and second invention is used in a third

I can't recall the technical term for this situation and question:
Invention A is patented.  Use of the A patent is licensed to be used in invention B.  Invention B includes invention A.  Invention B is used in multiple inventions, C1, C2, ...
Must the manufacturers and sellers of inventions C1, C2 etc. license patent A?
My searches may have worked better if I could recall the exact words for this situation.  "Patent Scope" returns too many unrelated articles.
My request to readers is for either a better search term or "the answer" if you happen to know it.
Thank you in advance.

The keyword I was missing was "downstream".  With that keyword in my search I found this article which answers my question:
http://www.klgates.com/us-supreme-courts-decision-limits-patent-owners-from-claiming-infringement-by-downstream-customers-06-13-2008/
I'll leave this post in which I answered my own question in case others may find it helpful.
« Last Edit: March 06, 2017, 12:54:42 PM by RPeruzzi »