Patents Assigned to Murphy Muffler, Inc.
  • Sound damping apparatus
    Patent number: 4049076
    Abstract: A sound damping apparatus has a resilient wall that defines a first volume and rigid walls defining a second or third volume. A gas entry communicates with the volume defined by the resilient wall. The resilient wall and the rigid walls are in contact such that gas pressure separates the walls and the wall to intermittently define a gas exit between volumes within the wall.
    Type: Grant
    Filed: November 6, 1975
    Date of Patent: September 20, 1977
    Assignee: Murphy Muffler, Inc.
    Inventor: Milo E. Murphy
  • Sound damping apparatus
    Patent number: 4049075
    Abstract: A sound damping apparatus has a resilient wall that defines a first volume and rigid wall defining a second or third volume. One rigid wall may be a part of the device muffled. A gas entry communicates with the volume defined by the resilient wall. The resilient wall and the rigid walls are in contact such that gas pressure separates the walls and the wall to intermittently define gas passages between volumes. Fluid within the wall surrounding the resilient wall dampens resilient wall vibration.
    Type: Grant
    Filed: November 6, 1975
    Date of Patent: September 20, 1977
    Assignee: Murphy Muffler, Inc.
    Inventor: Milo E. Murphy