Patents by Inventor Teuvo Ranta

Teuvo Ranta 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).

  • Double-walled structure in a ventilation duct system
    Patent number: 6062270
    Abstract: A double-walled structure in a ventilation duct system has an inner tube and an outer tube and, arranged therebetween, a sound-absorbing material. The inner tube is a helically-wound lock-seam tube formed from a sheet metal strip having parallel longitudinal areas of expanded metal.
    Type: Grant
    Filed: July 10, 1998
    Date of Patent: May 16, 2000
    Assignee: Lindab AB
    Inventors: Kent Hultberg, Teuvo Ranta, Hans Larsson
  • Method for producing a double-walled structure
    Patent number: 5911457
    Abstract: In a method of producing a double-walled structure, such as a silencer for use in a ventilation duct system, use is made of an arrangement having a forming head for forming helically-wound lock-seam tubing. In the forming head, a perforated metal strip is helically wound together with an air-permeable cloth strip such that the tubing fed out of the forming head has an outer cover of said cloth. The tube assembly consisting of the perforated tube and the cloth cover is provided with an outer tubular layer of insulating material and then inserted in a casing which makes the silencer complete.
    Type: Grant
    Filed: October 23, 1997
    Date of Patent: June 15, 1999
    Assignee: Lindab AB
    Inventors: Kent Hultberg, Teuvo Ranta
  • Apparatus for making a double-walled structure
    Patent number: 5881442
    Abstract: In an apparatus for producing a double-walled structure, such as a silencer for use in a ventilation duct system, use is made of an arrangement having a forming head for forming helically-wound lock-seam tubing. In the forming head, a perforated metal strip is helically wound together with an air-permeable cloth strip such that the tubing fed out of the forming head has an outer cover of said cloth. The tube assembly consisting of the perforated tube and the cloth cover is provided with an outer tubular layer of insulating material and then inserted in a casing which makes the silencer complete.
    Type: Grant
    Filed: October 22, 1997
    Date of Patent: March 16, 1999
    Assignee: Lindab AB
    Inventors: Kent Hultberg, Teuvo Ranta
  • Double-walled structure and method and arrangement for producing the same
    Patent number: 5801342
    Abstract: In a method of producing a double-walled structure, such as a silencer for use in a ventilation duct system, use is made of an arrangement having a forming head for forming helically-wound lock-seam tubing. In the forming head, a perforated metal strip is helically would together with an air-permeable cloth strip such that the tubing fed out of the forming head has an outer cover of said cloth. The tube assembly consisting of the perforated tube and the cloth cover is provided with an outer tubular layer of insulating material and then inserted in a casing which makes the silencer complete.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: September 1, 1998
    Assignee: Lindab AB
    Inventors: Kent Hultberg, Teuvo Ranta