Patents by Inventor Lawrence W. Callan

Lawrence W. Callan 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).

  • System for analyzing permeation of a gas or vapor through a film or membrane
    Patent number: 4656865
    Abstract: The invention is a system for measuring the permeation of a vapor or gas through a film or membrane. The device comprises a test cell which has two chambers which are separated by a membrane through which the permeation of a particular gas is measured. To one cell is fed a test gas or vapor either alone or in a mixture with a bulk gas. To the other side of the membrane is fed a bulk gas into which the permeating test gas or vapor permeates. Attached to the second chamber of the test cell is a means for analysis of the concentration of the test gas or vapor. This device further comprises a means for separately controlling the pressure in each chamber of the test cell. The device comprises a means for combining a portion of the bulk gas with the test gas or vapor in a manner such that the concentration of the test gas or vapor in the bulk gas can be carefully controlled. This means of combining the two gases is connected to the first chamber of the test cell.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: April 14, 1987
    Assignee: The Dow Chemical Company
    Inventor: Lawrence W. Callan