Depleted uranium, in these designs, is used for the ballast in the middle of the missile, for flight stability. Uranium, however, is used for the reactive material. Reactive materials are a way to increase lethality of the missile by “up to a factor of five” according to weapons makers. Indeed they introduce oxydation at the explosion of the missile. This means pyrophoricity. It has been acknowledged that combustion of uranium weapons produces temperatures of up to 5000°C.
To quote both patents, from the US Navy,
As is known in the art, reactive composite materials generally include particles or powdered forms of one or more reactive metals, one or more oxidizers, and typically some binder materials. The reactive metals can include aluminum, beryllium, hafnium, lithium, magnesium, thorium, titanium, uranium, zirconium, as well as combinations, alloys and hydrides thereof
As you can see, nowhere it is mentioned “depleted” uranium, but only “uranium”, demonstrating thus that this uranium is not intended to be depleted.
But it is interesting to have here, clearly, confirmation that uranium for reactive materials is not depleted. See links above and research by Dr. Asaf Durakovic who demonstrated that the uranium found in Iraq is more radioactive than depleted uranium.
Another older patent for an armor-piercing incendiary projectile mentions the use of uranium without calling it “depleted “uranium”, it seems the same conclusions can be drawn from it.
It perfectly makes sense in this context that some weapons have actually been designed with plutonium and by knowing that, anyway, ALL these weapons use NUCLEAR FISSION and thus do NOT need the addition of any incendiary material. Nuclear fission involves the use of non depleted uranium (little tips of highly enriched uranium compressed at the impact to increase density and reduce critical mass), hence very likely the actual explanation of these patents. 🙂