Patents by Inventor Ingemar Persson

Ingemar Persson 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).

  • Metal wall provided with either external or internal cladding
    Patent number: 4095734
    Abstract: A metal wall, such as that of a vessel, is provided with cladding which is welded to the metal wall such that an elongated space is formed between the weld seams. The elongated space allows for the testing of the weld seams for leakproofness by closing off one end of the space and injecting a gaseous medium, or the like, into the space and gauging whether or not the medium exits via the weld seams. A plate made of rubber, plastic or the like may also be used in welding the cladding to the metal wall, which plate covers the unconnected ends of the two cladding parts making up the cladding layer for the metal wall.
    Type: Grant
    Filed: February 27, 1976
    Date of Patent: June 20, 1978
    Assignee: Nitro Nobel AB
    Inventor: Per Ingemar Persson
  • File
    Patent number: 4006992
    Abstract: A file for holding perforated sheets is provided adjacent its spine with a pair of spaced apart tubular prongs for cooperation with the sheet perforations. The file is provided at its spine with a leaf spring of which a portion protruding from the inner side of the spine, in the position of use of the file, abuts against the web of a substantially U-shaped wire member, the arms of which engage the tubular prongs to retain the sheets to the tubular prongs. The leaf spring portion protruding from the spine to cooperate with the web of the U-shaped wire member has a tongue integral with the protruding leaf spring portion and directed towards the spine of the file. When the protruding leaf spring portion is caused to abut against the web of the U-shaped wire member, the tongue snaps home under the wire to lock the leaf spring to the U-shaped wire member.
    Type: Grant
    Filed: March 5, 1976
    Date of Patent: February 8, 1977
    Inventor: Sven-Olof Ingemar Persson
  • Cord winding structure
    Patent number: 3999640
    Abstract: A cord winder arrangement particularly for a vacuum cleaner or other household appliance in which the vacuum cleaner housing is provided with a section having a closable access door through which the cord and the electrical connection plug passes through when the vacuum cleaner is inoperative, thereby enclosing the electrical cord and its plug entirely within the vacuum cleaner housing. The access door is operated by a foot button that opens the door and, at the same time, projects the plug out of the housing when it is desired to operate the appliance.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: December 28, 1976
    Assignee: Aktiebolaget Electrolux
    Inventor: Gunnar Ingemar Persson