Patents by Inventor Steven Parfitt

Steven Parfitt 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: 11824535
    Abstract: A fail-safe counter evaluator is provided to insure proper counting operations by fail-safe counters. The failsafe counter evaluator comprises a first microprocessor, a first counter, a second counter, a second microprocessor and a test channel. The first counter is configured as a counter in operation and disposed in the first microprocessor to receive externally generated count pulses. The second counter is disposed in the first microprocessor and configured to undergo a test. The test channel is configured to send an input test signal to the second counter based on test pulses from the second microprocessor. The first microprocessor and the second microprocessor are synchronized so that to coordinate a start and an end of the test. The second counter is evaluated after the test pulses have been sent to determine if the second counter is operating properly.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: November 21, 2023
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Steven Parfitt, Steven M. Hausman
  • Publication number: 20210258012
    Abstract: A fail-safe counter evaluator is provided to insure proper counting operations by fail-safe counters. The failsafe counter evaluator comprises a first microprocessor, a first counter, a second counter, a second microprocessor and a test channel. The first counter is configured as a counter in operation and disposed in the first microprocessor to receive externally generated count pulses. The second counter is disposed in the first microprocessor and configured to undergo a test. The test channel is configured to send an input test signal to the second counter based on test pulses from the second microprocessor. The first microprocessor and the second microprocessor are synchronized so that to coordinate a start and an end of the test. The second counter is evaluated after the test pulses have been sent to determine if the second counter is operating properly.
    Type: Application
    Filed: July 11, 2018
    Publication date: August 19, 2021
    Inventors: Steven Parfitt, Steven M. Hausman