Hm. Well, companies DO buy patents all the time, and people sell them all the time. I have a couple that I would like to trade with a certain large
medical imaging company in exchange for free (but restricted in scope) rights on one of theirs. That's how that works a lot of the time. You got
chocolate, I have peanut butter, we'll get together and make a new taste sensation.
In terms of "bury", it's not like they can make them go away. They'd still be in the registry. They might have it and not license it out for the
duration of the patent, I guess you could call that "buried". Drugs and medical devices can be have their patent terms extended by the Hatch-Waxman
act, sometimes.
If it's a patent of interest to the military or government, they can gag a patent under 35 USC 181/182, and it will vanish off the registry,
if it's been listed before they realize it, or if they notice it when you file, it will be sent to a board that decides if it gets the gag. If
gagged, it's issued a special registry number, and you will be restricted to whom you can grant license to. You still have the patent. If it's used,
you still get paid, but you have to apply to agencies that filed the gag for permission to license it out.
In practice, you'll generally get a list of permitted licensees, if someone's interested.
If it's nuclear in nature, and DOE gets antsy, you can also end up with your invention filed as a "born secret" and then you have special issues,
but it's a similar process.
Gags and "born secrets" are not done by industry, though, it's usually for stuff you really might not want out, like a new way to make
organophosphates or something.

