Civil and Environmental Engineering and Earth Sciences

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  • Inventor(s):
    Robert L. Irvine, Rajagopalan Venkatadri
    Patent Number:
    US 5342765 B2
    Description:

    Disclosed is a method of producing an extracellular product from an aerobic microorganism. The microorganism is grown in an aqueous medium on one side of an oxygen-permeable surface while the opposite side of the surface is contacted with oxygen. The extracellular product is then harvested from the aqueous medium. The method is particularly useful in producing lignin peroxidase from the white rot fungus Phanerochaete chrysosporium.

    Date Issued:
    1994-08-30
    Resource Type
    Patent
  • Inventor(s):
    Arthur H. Hale, Peringandoor R. Hariharan, Sanjit Roy
    Patent Number:
    US 5637795 B2
    Description:

    A novel process and apparatus have been contrived for the study of the bit/stabilizer balling phenomenon in the laboratory. The device permits a standard testing procedure using a specially designed bob simulating the drill bit for comparing degrees of balling for different rock formations under different drilling conditions involving variable and controlled parameters like weight-on-bit, revolutions-per-minute (rpm), drilling fluids, etc.

    Date Issued:
    1997-06-10
    Resource Type
    Patent