The patent filed on 1985 and published in 1989 by Olin Corporation, titled “SABOTED, LIGHT ARMOUR PENETRATOR ROUND WITH IMPROVED POWDER MIX”, is a very interesting document.
It explains the failed Army development of a saboted penetrator projectile for the 7.62 Nato caliber, and how Olin Corp was able to make it work by switching to a very fine grained spheroidal propellant. It is really well written (for a patent) and could make for a post in this specialized forum.
It doesn’t have any drawings, but everybody knows the SLAP round, don’t we?
For the legal status of the patent, and the patent in other languages, see