Patents by Inventor Philip E. Foster

Philip E. Foster 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 making optical preforms from tubular bodies
    Patent number: 4632684
    Abstract: An arrangement for collapsing tubular formations into optical preforms includes a control arrangement which controls the pressure build-up at the downstream end of the tubular formation during all of but the last one of the collapsing increments to control the flow of a gaseous medium through the interior of the tubular formation from an upstream end to and beyond the downstream end of the tubular formation. The magnitude of the back-up pressure is controlled by a set point controller in dependence on the actual value of the back-up pressure, the set point controller being operative for counteracting any deviation from the desired pressure. The set point controller controls the flow-through cross-section of a control valve that admits a pressurized inert gas to a region situated downstream of the downstream end of the tubular formation and also downstream of the point at which the pressure build-up is being measured.
    Type: Grant
    Filed: July 31, 1984
    Date of Patent: December 30, 1986
    Assignee: ITT Corporation
    Inventors: Kamran Karbassiyoon, Philip E. Foster, Francis I. Akers, Daniel G. Fletcher