Here are links to some high security lock patents I put together, you will need Adobe Acrobat reader 6.0 or higher.
Assa Twin 758 kb
Best SFIC 998 kb
Bilock 511 kb
Bilock #2 870 kb
Bramah 892 kb
Dom 862 kb
Evva 518 kb (Thanks n2oah)
Evva#2 550kb (Thanks n2oah)
Medeco Biaxial 403 kb
Mul T Lock 1.03 mb
A Supra lock of some sort 1.03 mb
If you want a specific patent pm me and I will post it.