Patent ID: 8824241

Claim:
A method of communicating within a wellbore, the wellbore having a drilling mud circulation system therein, the circulation system being through a drill string, a drilling sub affixed to said drill string, a drill bit and an interior of said wellbore, the method comprising: positioning a valve means in a fluid passageway of said drilling sub; positioning a brake with a brake piston in said drilling sub, said brake piston being cooperative with said valve means; sensing a quantifiable downhole condition; initiating a flow of drilling mud through said circulation system; forming a flow restriction within the circulation system at said drilling sub, said flow restriction being said valve means; sensing said flow of drilling mud through said valve means, wherein said valve means is opened according to a predefined pressure drop across said valve means; activating said brake piston from a first receded fixed position to a second receded fixed position so as to allow said valve means to release a first percentage of pressure; releasing said first percentage of pressure across said valve means within said flow restriction at a first time; releasing a second percentage of pressure across said valve means within said flow restriction at a second time, a time between said first time and said second time being correlative to the downhole condition; and determining downhole condition changes from a surface location by sensing the time between said first time and said second time.