Hi reefburnaby,
As far as the linkage and motor goes, all the major car manufacturers already had that one figured out long ago. Its a typical wiper motor mechanism array with gear-motor and linkages. :P
So lets strike that patent infringement off the list.
For the rotating outer tube, it may be more challenging. As for the 90 degree inlet and outlet, give me a break! You can't patent that.
You can't patent a function, only an implementation. As long as no one challenges it in court the patent stands, in the U.S that is.
The challenge is the outer tube oscillating around the fixed inner tube, neat idea but not entirely the biggest innovation ever. Hose reel, lawn sprinkler, irrigation spouts, etc, etc, etc.
I think your approach has great potential, albeit lots of wear problems and maintenance. If you wish, please sketch out your design and e-mail it to me, we'll take it from there.
Van