This is only the opening gun but US producers, under pressure from imports, are suing the Korean firms for patent infringement in both the International Trade Commission and the courts
link here. Silicon Valley flash memory maker Spansion is suing Samsung as well as a long list of companies like Apple using the chips. After announcing that it would be reducing its employees by half or 5000, a Spansion share rose 20 cents to $0.50.
In a similar case, Kodak is suing Korean companies Samsung and LG for violating its digital camera patents.
To read more about these cases, Google spansion+samsung.
I guess we can expect more such suits, given the recession and the drop in consumer demand. The great advantage of pursuing these cases before the ITC is that it usually acts much more rapidly than the courts.