Patents by Inventor Curtis G. Terwilliger

Curtis G. Terwilliger has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4476467
    Abstract: An arbitrary number of member computer stations are inter-connected by a "party" communication network. Each member station is normally in a high impedance Monitor Mode, for monitoring in-coming messages. The incoming messages latch the monitoring stations into a Receive Only Mode for preventing "interrupts" of on-going communications. Each station continuously monitors the input impedance from the network, to determine when the network is available for transmission. Member stations may enter the low impedance Transmit Mode only when the network is available, because all of the other stations are in the Monitor Mode. A high Z from the network indicates to each station that the network is available. A low Z indicates that another station is in the transmit Mode, and is in control of the network. The random entry of two (or more) parties at the same time is resolved by a Pre-Transmission Test Cycle.
    Type: Grant
    Filed: June 8, 1982
    Date of Patent: October 9, 1984
    Assignee: Cromemco Inc.
    Inventors: Curtis G. Terwilliger, W. James McKeefery, Szu C. Sun, Roger D. Melen
  • Patent number: 4319200
    Abstract: A phase detector generates an error signal by comparing an input data rate F:in with an output clock rate F:out. The error signal is amplified and applied to the base of an emitter follower circuit. Current from a discharging capacitor within a clock ramp generator flows through the emitter follower and the emitter impedance. The ramp current is controlled by the error signal. The ramp rate F:out is determined by the peak to peak ramp voltage and by the rate of discharge of the ramp capacitor. Variations in the error signal due to F:in drift, cause a compensating change in F:out for continuously maintaining sync between F:in and F:out within each passband. Multi-passband capability is provided by a multi-level current generator which also supplies current through the emitter impedance. The ramp current is reduced to a lower level by an amount equal to the current from the multi-level current source due to the emitter follower action.
    Type: Grant
    Filed: February 4, 1980
    Date of Patent: March 9, 1982
    Assignee: Cromemco Inc.
    Inventor: Curtis G. Terwilliger