Patents by Inventor Aldo B. Alles

Aldo B. Alles 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).

  • Piezoresistive sensor
    Patent number: 5297438
    Abstract: An electrical circuit containing novel piezoresistive sensor is disclosed. The sensor is connected to a source of direct current, and a manometric pressure of at least about 15 p.s.i.g. is applied to the sensor.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: March 29, 1994
    Assignee: Alfred University
    Inventors: Aldo B. Alles, Walter A. Schulze
  • Piezoresistive sensor
    Patent number: 5225126
    Abstract: An electrical circuit containing novel piezoresistive sensor is disclosed. The sensor is connected to a source of direct current, and a stress of at least about 15 p.s.i. is applied to the sensor.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: July 6, 1993
    Assignee: Alfred University
    Inventors: Aldo B. Alles, Walter A. Schulze
  • Process for preparing a PTC thermistor
    Patent number: 4981633
    Abstract: A process for preparing a positive temperature coefficient thermistor is disclosed. This thermistor is comprised of at least about 60 weight percent of undoped, crystalline, ferroelectric material, and it has a room-temperature resistivity of less than 5,000 ohm-centimeters, an undegraded resistivity of at least about 1,000,000 ohm-centimeters, a degraded resistivity of at least about 900,000 ohm-centimeters, a ratio between its undegraded resistivity and its room-temperature resistivity of at least about 1,000, and a ratio between its undegraded resistivity and its degraded resistivity not exceeding 2.0.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: January 1, 1991
    Assignee: Alfred University
    Inventors: Aldo B. Alles, Vasantha R. W. Amarakoon, Vernon L. Burdick