About completing Ph.D degree in the US Industry
I have known a number of people who have done a Ph.D. while in industry (in partnership with an advisor at an appropriate degree-granting university of course), often closely tied to the work that they are doing in industry.  This is relatively unusual, however, because it requires that one's industrial work be both at a high enough level for a Ph.D. and also able to be disclosed through scientific publication.  

Thus, if you're in an industrial environment where people are publishing regularly (my company is an example of such), it's not too hard to make work, but in a "generic" industrial job it would be difficult.