Laterally Displaceable Needle Patents (Class 66/72)
Narrowing and widening (Class 66/73)
  • Process and plant for the production of urea
    Patent number: 6552224
    Abstract: A process for urea production in a synthesis loop based on CO2 stripping is distinguished by the fact that at least part of a flow recycle carbamate is sent to a treatment of carbamate decomposition and removal of free ammonia to obtain a vapour flow containing CO2 and NH3 with minimum content of water, and a weak water carbamate solution sent back to a urea recovery unit URS and being at least part of above vapour flow containing CO2 and NH3 with minimum content of water directly fed to the bottom zone of a reaction space.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: April 22, 2003
    Assignee: Urea Casale S.A.
    Inventors: Giorgio Pagani, Federico Zardi, Domenico Romiti
  • Voltage comparator circuit
    Patent number: 6147517
    Abstract: Control circuit for providing the greater of a supply voltage V.sub.CC and a battery voltage V.sub.BATT. A comparator compares V.sub.CC and V.sub.BATT, and provides output signals to an inverting gain stage. A switch receives output signals from the inverting gain stage and provides the greater of V.sub.CC and V.sub.BATT as the circuit output and as the comparator supply voltage. The circuit output voltage rapidly switches between V.sub.CC and V.sub.BATT as the comparison status of the two voltages changes.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: November 14, 2000
    Assignee: Sipex Corporation
    Inventors: Bassem M. AlNahas, Alex Gusinov, Jeffrey B. Van Auken