Lol. No.
Iron Doma was designed by Rafael, from scratch. With development financing by Israel.
No “off-chute” from Patriot. Wherever did you get that idea?
Anyway. The important thing is that Israel doesn’t let the US have any influence on the program or who ends up with the product, because the US interest is anti-Israel and pro-islamist.
There’s been enough technology developed by Israel and channeled by the US to the jihadis.
According to this Wiki on the Iron Dome it was developed by Rafael.
http://en.wikipedia.org/wiki/Iron_Dome
Sec. 237. Availability of funds for Iron Dome short-range rocket defense program.
Of the amounts authorized to be appropriated for fiscal year 2013 by section 201 for research, development, test, and evaluation, Defense-wide, and available for the Missile Defense Agency, $210,000,000 may be provided to the Government of Israel for the Iron Dome short-range rocket defense program as specified in the funding table in section 4201.
National Defense Authorization Act for Fiscal Year 2011
Section 1507—Iron Dome Short-Range Rocket Defense Program
This section would allow the Secretary of Defense to provide up to $205.0 million from the funds authorized in section 1506 of this title for Defense-Wide Activities Procurement to the Government of the State of Israel for procurement of the Iron Dome defense system to counter short-range rocket threats.