Patents by Inventor Graham John Clarke

Graham John Clarke 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).

  • Control devices
    Patent number: 4112340
    Abstract: A manually rotatable control knob is coupled to a d.c. ironless motor which maintains rotation of the knob once it is initially spun by hand. The initial back e.m.f. of the motor is sensed and is used via a feedback loop having a particular time constant to determine the subsequent rotational speed of the knob. By correctly profiling the time constant the inertial effect of a heavy flywheel can be simulated.
    Type: Grant
    Filed: March 16, 1977
    Date of Patent: September 5, 1978
    Assignee: Marconi Instruments Limited
    Inventor: Graham John Clarke