Resper asks: Can I license a patented technology and improve upon it, then patent the new improvements?
Answer: While this is a very interesting question, it has very little to do with potatoes. It is possible that potatoes were invented upon this planet by alien robots, partially as a joke, partially as an experiment. If one wished to improve upon whatever potato patent they might have, and patent the new creation, you would have to work it out with them.
-Mr. Advice Man