Pogue seems to have been bought out by the oil companies, and he did well for himself. Other inventors and tweakers have seen their offices/labs trashed and I have heard of disappearances and foul-play. Of course, you cannot believe everything you read, but considering what is at stake for the major movers-and-shakers, I wouldn't put it past them to do whatever it takes to keep what they have.
http://befreetech.com/suppressed_inventions.htm has more listings, including Canadian patents (Charles N. Pogue was Canadian).
Pogue seems to have been bought out by the oil companies, and he did well for himself. Other inventors and tweakers have seen their offices/labs trashed and I have heard of disappearances and foul-play. Of course, you cannot believe everything you read, but considering what is at stake for the major movers-and-shakers, I wouldn't put it past them to do whatever it takes to keep what they have.