Apparatus For Producing Preselected Time Intervals For Use As Timing Standards (generating Clock Signals For Electric Digital Computers G06f 1/04; Regulating Frequency In General H03c, L) [g04f 5/00] Patents (Class 968/817)

Cross-Reference Art Collections

Metronomes (periodic signalization by acoustic signals in general subclass 218) [g04f 5/02] (Class 968/818)
Using oscillators with electromechanical resonators (producing electric oscillations or timing pulses [g04f 5/04] (Class 968/822)
Using electric or electronic resonators (subclass 829 takes precedence) [g04f 5/10] (Class 968/827)
Using fluidic devices [g04f 5/12] (Class 968/828)
Using atomic clocks [g04f 5/14] (Class 968/829)
Using pulses produced by radioisotopes [g04f 5/16] (Class 968/830)
  • Electronic postage meter system having plural clock system providing enhanced security
    Patent number: 5999921
    Abstract: A system includes a system time counter associated with a micro controller and a secure clock module having a real time clock and an elapsed time counter. The system synchronizes operation between the secure clock module and the system time counter. The synchronized time entered into the system time counter is utilized in the operation of the system. The real time clock time can be caused to be entered into the elapsed time counter at certain point in the operation of the system. The relationship of the time provide enhanced systems security.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: December 7, 1999
    Assignee: Pitney Bowes Inc.
    Inventors: Robert Arsenault, William Bailey, Craig DeFilippo