Appeal No. 1998-1600 Application No. 08/434,898 data not to the subsurface instruments, as does the instant claimed invention, but, rather, to a satellite. Clearly, Schultz does not disclose a modem. At best, Schultz discloses a general teaching of a wake-up call in order to preserve battery power in a pressure measuring device. Therefore, it is difficult to see how any combination of Schultz with the other two references would result in the two-way communication claimed wherein a master modem means inductively couples a plurality of subsurface instrument specific wake-up command signals to each subsurface instrument and a slave modem in each subsurface instrument generates modem encoded signals related to the data signal and receives modem encoded signals from the master modem. Further, claim 8 requires that the subsurface instrument to receive the wake-up call be selective; i.e., the use of instrument specific wake-up commands. Thus, the claim recites, that the master modem inductively couples a “plurality of subsurface instrument specific wake-up command signals to each subsurface instrument” and that there is a switch means operable in a sleep mode “in each subsurface unit” for reducing power consumption of “the” subsurface instrument by removing power from the transducer and slave modem. Further, there is a “continuously powered wake-up detector in each subsurface instrument” so that the switch means may apply power to the transducer and the slave modem in response to the wake-up signal specific to that 5Page: Previous 1 2 3 4 5 6 7 8 NextLast modified: November 3, 2007