Patents by Inventor Jeffrey L. Fleischut

Jeffrey L. Fleischut 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).

  • Reclosable vacuum-tight pressure-relief device having a deformable seal member
    Patent number: 8171954
    Abstract: A pressure-relief valve assembly is improved in that sealing surfaces on both the valve seat and valve head are confrontationally disposed annular planar surfaces oriented substantially perpendicular to the valve axis. A resilient valve seal is formed of a material which deforms to a predetermined extent into sealing engagement against both sealing surfaces when compressed by the spring biasing force. When a vacuum exists the combination of the spring force and a holding force created by a pressure differential acts to increase the extent of compression between the resilient valve seal and both sealing surfaces sufficient to create a vacuum-tight seal. The magnitude of the spring biasing force in discrete increments may be adjusted by varying the degree of threaded engagement between members forming the valve housing.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: May 8, 2012
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Daniel A. Hancock, William L. Holstein, Jeffrey L. Fleischut
  • RECLOSABLE VACUUM-TIGHT PRESSURE-RELIEF DEVICE HAVING A DEFORMABLE SEAL MEMBER
    Publication number: 20100072409
    Abstract: A pressure-relief valve assembly is improved in that sealing surfaces on both the valve seat and valve head are confrontationally disposed annular planar surfaces oriented substantially perpendicular to the valve axis. A resilient valve seal is formed of a material which deforms to a predetermined extent into sealing engagement against both sealing surfaces when compressed by the spring biasing force. When a vacuum exists the combination of the spring force and a holding force created by a pressure differential acts to increase the extent of compression between the resilient valve seal and both sealing surfaces sufficient to create a vacuum-tight seal. The magnitude of the spring biasing force in discrete increments may be adjusted by varying the degree of threaded engagement between members forming the valve housing.
    Type: Application
    Filed: September 17, 2009
    Publication date: March 25, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: DANIEL A. HANCOCK, William L. Holstein, Jeffrey L. Fleischut