Is it possible to work full time in an industry position while on sabbatical? The standard situation in US research universities is for the university to pay one semester of salary for a year of sabbatical leave, and faculty typically take this sabbatical at another university or research lab, where there is a clear sense of how to fund the sabbatical.

I'm interested to know whether anyone has experience on how to (ethically) fund an industry sabbatical.  Specifically:


Is it possible to work full time in an industry position?  If so, do you get half-pay?  Half-hours?
What (ethical) obligations do you have to ongoing grants (say from the National Science Foundation) during such a sabbatical year?
What (ethical) obligations do you have towards the university that is paying a semester of salary?
Every university has a policy for addressing these matters, and it is best that you obtain the specific policy from your own institution -- a general survey of what goes on at other places will likely not be informative to your present situation.  Federal funding sometimes can be used to cover the other part of your salary -- but, again, it depends on the funding source and the rules of your institution.