Patents by Inventor John F. Graham

John F. Graham 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).

  • Porosity measurement
    Patent number: 4198853
    Abstract: The present invention provides a method and apparatus for evaluating the porosity of a sheet material at a given value of gas flow or pressure drop (PD), with account being taken of the following relationship between the parameters of flow and PD:Flow=A (PD).sup.N,in which one of the parameters is set at a number (e.g. 3) of values close to the said required value, the other parameter is measured at each, the values of A and N for the sample under test are calculated therefrom, and then the precise gas flow (or PD) at the given PD (or gas flow), and hence the porosity, is calculated from the said relationship. The automatic setting, and the calculations, are effected by means of a microprocessor.
    Type: Grant
    Filed: November 2, 1978
    Date of Patent: April 22, 1980
    Assignee: American Filtrona Corporation
    Inventors: John F. Graham, Donald Hardy
  • Multiple use service cart
    Patent number: D243518
    Type: Grant
    Filed: November 3, 1975
    Date of Patent: March 1, 1977
    Assignee: Honeywell Information Systems Inc.
    Inventors: Richard R. Dillon, John F. Graham
  • Computer or similar article
    Patent number: D243771
    Type: Grant
    Filed: November 28, 1975
    Date of Patent: March 22, 1977
    Assignee: Honeywell Information Systems, Inc.
    Inventors: John F. Graham, Richard R. Dillon
  • Document handling cart or similar article
    Patent number: D245594
    Type: Grant
    Filed: June 4, 1976
    Date of Patent: August 30, 1977
    Assignee: Honeywell Information Systems Inc.
    Inventors: John F. Graham, Donald D. Kelemen