Patents by Inventor Hal Dry

Hal Dry 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).

  • Adjustable diffusers
    Patent number: 4014253
    Abstract: Adjustable diffusers of the type employed for control of flow of air into or out of a space. The diffusers according to the invention have a louvered face plate and have plural parallel vanes behind the face plate each movable between closed and opened positions. The diffusers have interchangeable control plates which have J-slots to control the vane positions and by substitution of which the directions of rotations of the vanes may be altered. The diffusers are of simplified design as compared with present commercially available diffusers.
    Type: Grant
    Filed: November 14, 1975
    Date of Patent: March 29, 1977
    Assignee: Wallace-Murray Corporation
    Inventor: Hal Dry
  • Dampers
    Patent number: 3951051
    Abstract: Dampers operable by energization of an electrical circuit or by deenergization thereof to open or close, for control of smoke ventilation in case of a fire. The dampers are held closed, or open, either by a magnet or by a spring. The dampers may be used in ventilation systems of any other type.
    Type: Grant
    Filed: July 2, 1974
    Date of Patent: April 20, 1976
    Assignee: Wallace-Murray Corporation
    Inventor: Hal Dry