Patents by Inventor John A. Bonnard

John A. Bonnard 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).

  • Method of and apparatus for determining melting points
    Patent number: 4927270
    Abstract: The melting point of a powdery or particulate material is determined by allowing a sample of the material to contact a heated surface. If the material does not melt it is removed from the surface and the temperature of the surface is increased. The process is repeated until the material is observed to melt on the surface, the temperature of the surface at that time being observed in order to determine the melting point in question.
    Type: Grant
    Filed: November 9, 1988
    Date of Patent: May 22, 1990
    Inventor: John A. Bonnard
  • Calorimetric apparatus
    Patent number: 4925315
    Abstract: Colorimetric apparatus which includes a water tank, a container in the tank, a pressure vessel in the container, and a pump. The apparatus is worked in three phases. In the first phase the water in the tank is mixed and brought to a desired temperature. In the second phase water is pumped from the tank, through a jacket which surrounds the pressure vessel, and back to the tank, to bring the pressure vessel to the tank temperature. After a sample of material is combusted in an oxygen atmosphere in the pressure vessel, the third phase takes place. Water is circulated in a closed path which includes the jacket and the temperature of this water is monitored. The variation of this temperature is used to calculate the colorific value of the substance.
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: May 15, 1990
    Inventor: John A. Bonnard
  • Apparatus for measuring thermal and other quantities of substances
    Patent number: 4616938
    Abstract: Apparatus for measuring the calorific value and other quantities of combustible substances. The apparatus includes a support structure to which a pressure vessel is mounted. The pressure vessel has a cap which provides access to a combustion chamber within the pressure vessel. The pressure vessel is preferably of a double walled construction and a fluid flowpath is formed between the two walls. During combustion tests the temperature of fluid in the flowpath is monitored. Surrounding the pressure vessel is a temperature loss control means which in the preferred embodiment comprises a water jacket through which water is circulated at constant temperature. The invention extends to a method of measuring thermal quantities of combustible substances as well as to a method of determining the sulphur content of combustible substances.
    Type: Grant
    Filed: January 6, 1984
    Date of Patent: October 14, 1986
    Assignee: Leco Corporation
    Inventor: John A. Bonnard