Patents by Inventor Leroy F. Silva

Leroy F. Silva 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: 5388848
    Abstract: A new and improved kick stand apparatus for a two-wheeled vehicle, such as motorcycle, includes respective independently operable, first and second leg assemblies, each respective leg assembly being connected to the vehicle and capable of being placed in a lowered position or in a retracted position by an operator's foot. The kick stand apparatus is for preventing the motorcycle from falling onto one side or the other when the motorcycle is parked. When both the first leg assembly and the second leg assembly are in a lowered position, together they are capable of maintaining the parked motorcycle in an upright orientation. In employing the apparatus, a leg member of the first leg assembly is lowered from a retracted position. The motorcycle is leaned toward the lowered leg member of the first leg assembly, and the motorcycle is permitted to rest in a first rest position upon a foot of the first leg assembly. Then, a leg member of the second leg assembly is lowered from a retracted position.
    Type: Grant
    Filed: July 12, 1993
    Date of Patent: February 14, 1995
    Inventors: Leroy F. Silva, Darwayne Fisher
  • Patent number: 4994952
    Abstract: There is provided a low-noise switching power supply for producing a regulated output voltage from an unregulated supply. The power supply includes a main transformer having first, second and third legs. A primary winding associated with a first leg produces an alternating magnetic flux in the core. A load winding associated with a second leg produces the output voltage from the power supply. A control winding is associated with the third leg. The regulated output voltage is compared to a reference voltage and used to operate a control circuit which alternately short circuits the control winding so as to vary the reluctance pass in the transformer and maintain the output voltage at a substantially constant predetermined value. A feedback circuit including a coupling transformer connects the primary coil to the switching circuit to improve regulation and provide a "soft start" capability.
    Type: Grant
    Filed: September 20, 1989
    Date of Patent: February 19, 1991
    Assignee: Electronics Research Group, Inc.
    Inventors: Donald M. Silva, LeRoy F. Silva, Fred M. Fehsenfeld, Sr.
  • Patent number: 4876638
    Abstract: There is provided a low-noise switching power supply for producing a regulated output voltage from an unregulated supply. The power supply includes a main transformer having first, second and third legs. A primary winding associated with a first leg produces an alternating magnetic flux in the core. A load winding associated with a second leg produces the output voltage from the power supply. A control winding is associated with the third leg. The regulated output voltage is compared to a reference voltage and used to operate a control circuit which alternately short circuits the control winding so as to vary the reluctance pass in the transformer and maintain the output voltage at a substantially constant predetermined value. A feedback circuit including a coupling transformer connects the primary coil to the switching circuit to improve regulation and provide a "soft start" capability.
    Type: Grant
    Filed: February 10, 1988
    Date of Patent: October 24, 1989
    Assignee: Electronic Research Group, Inc.
    Inventors: Donald M. Silva, Leroy F. Silva, Fred M. Fehsenfeld, Sr.