Appeal No. 95-1276
Application 07/839,969
Appellants’ invention is directed to a method for
performing logging while drilling with a hollow drill string
having a drill bit at its lower end. Claim 80 is illustrative of
the claims on appeal and recites:
80. A method for performing sonic logging while
drilling a borehole traversing an earth formation, including
drilling the borehole with a drill string having a drill bit at
its lower end and drilling fluid in the borehole surrounding the
drill string, the steps comprising:
a) drilling with a drill collar incorporated into the
drill string;
b) transmitting, from a location on said drill collar,
acoustic energy into the surrounding earth formations;
c) receiving, at a location on said drill collar,
acoustic energy returned from the surrounding earth formations;
d) providing an output related to the received acoustic
energy; and
e) determining from said output a characteristic of
said earth formations.
THE REFERENCE
The following references were relied on by the examiner
to support the final rejection:
Ely 2,757,358 July 31, 1956
Moser et al. (Moser) 3,190,388 June 22, 1965
Schuster 3,191,141 June 22, 1965
Cox et al. (Cox) 4,293,936 Oct. 6, 1981
Kent et al. (Kent) 4,302,826 Nov. 24, 1981
Lygas 4,636,999 Jan. 13, 1987
Hoyle et al. (Hoyle) 4,850,450 July 25, 1989
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