"I thought Whirlpool had taken legal action against LG because Whirlpool had the Filter Stream washing in their combos."
Well, if they did, I'm not sure what to say, but it doesn't put them under a good light, as theater folks would say... ;-)
To begin with, WP's patent expired eons ago, and it's not very bright to sue for that reason.
And if we go by a more recent patent (which I am almost sure has expired too, it was new in the very late 70's/very early 80's, I think), the "Jet System" used by AEG would probably be the folks who could sue LG.
If I'm not mistaken, the "small" yet significant difference is that the WP system kept all the water in the sump below the basket and the AEG system filled the basket almost as usual, using the jets to help saturate the clothes instead of the only way to get water to the clothes. Not too long after the AEG Jet System came out, again, if I'm not mistaken, other brands started using the "scoop & shower" vanes instead of the Jet System to reduce the water level in the basket and save energy.
At this point, unless you have special claims either scoop & shower, jet system or a jet stream like WP's should be free to use by anyone.
(Incidentally, I wonder when companies will discover the power of good will -- United Airlines, for example, are *still* getting lambasted for doing all kinds of wrong things with people's *reserved* tickets; meanwhile, companies like Volvo and Mercedes keep getting kudos for patenting things and either letting other companies use the idea for free or for a very small fee, thus saving lives. The reason I mention this is because about 10-15 years ago, some company was suing another for patent infringement on their "large ventilation hole to prevent children from suffocating inside a FL" -- dude, sure, get the patent, but make a big deal about it and let others use it on the condition you get credit, much better to have the good will and recognition than the 10 cents royalty!)