Patents by Inventor Harold C. Hubbard

Harold C. Hubbard 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).

  • Hydraulic pressure transducer with electrical output
    Patent number: 4184377
    Abstract: A hydraulic transducer of the Bourdon tube type, in which the amount of light transmitted by a light emitting diode to a photoresistor is controlled by a shutter. The device provides an enclosed and compact transducing unit which has particular application with tractor/trailer braking systems.
    Type: Grant
    Filed: August 14, 1978
    Date of Patent: January 22, 1980
    Assignee: Motor Wheel Corporation
    Inventor: Harold C. Hubbard
  • Remote control circuit for electric trailer brakes
    Patent number: 4128146
    Abstract: A remote control circuit for regulating current to electric trailer brakes as a function of the brake fluid pressure within the tractor brake system or in response to activation of a control arm by the tractor operator. A hydraulic transducer is connected directly to the tractor brake system to produce an electrical signal at the control circuit which varies as a function of the hydraulic fluid pressure. An electromagnetic, pressure-responsive circuit is also disclosed which is operatively connected to the trailer brakes and which retards movement of the operator control arm at the control circuit in proportion to the brake torque applied at the trailer.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: December 5, 1978
    Assignee: Motor Wheel Corporation
    Inventor: Harold C. Hubbard
  • Remote control circuit for electric trailer brakes
    Patent number: 4076327
    Abstract: A remote control circuit for regulating current to electric trailer brakes as a function of the brake fluid pressure within the tractor brake system or in response to activation of a control arm by the tractor operator. A hydraulic transducer is connected directly to the tractor brake system to produce an electrical signal at the control circuit which varies as a function of the hydraulic fluid pressure. An electromagnetic, pressure-responsive circuit is also provided which is operatively connected to the trailer brakes and which retards movement of the operator control arm at the control circuit in proportion to the brake torque applied at the trailer.
    Type: Grant
    Filed: April 14, 1977
    Date of Patent: February 28, 1978
    Assignee: Motor Wheel Corporation
    Inventor: Harold C. Hubbard
  • Remote control circuit for electric trailer brakes
    Patent number: 4033630
    Abstract: A remote control circuit for regulating current to electric trailer brakes as a function of the brake fluid pressure within the tractor brake system or in response to activation of a control arm by the tractor operator. A hydraulic transducer is connected directly to the tractor brake system to produce an electrical signal at the control circuit which varies as a function of the hydraulic fluid pressure. An electromagnetic, pressure-responsive circuit is also provided which is operatively connected to the trailer brakes and which retards movement of the operator control arm at the control circuit in proportion to the brake torque applied at the trailer.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: July 5, 1977
    Assignee: Motor Wheel Corporation
    Inventor: Harold C. Hubbard