sentences:  There are instances, such as the case of some medical technologies, where products are phased out the market because they are no longer viable as business ventures.Some orphaned technologies do not suffer complete abandonment or obsolescence.For instance, there is the case of IBM's Silicon Germanium (SiGe) technology, which is a program that produced an "in situ" doped alloy as a replacement for the conventional implantation step in silicon semiconductor bipolar process.