Compressible objects having a predetermined internal pressure combined with a drilling… Grant US-8088716-B2 United States of America 03 Jan 2012
Compressible objects having partial foam interiors combined with a drilling fluid to form… Grant US-8088717-B2 United States of America 03 Jan 2012
Compressible objects combined with a drilling fluid to form a variable density drilling… Grant US-8076269-B2 United States of America 13 Dec 2011
Method for fabricating compressible objects for a variable density drilling mud Grant US-7972555-B2 United States of America 05 Jul 2011