Patents by Inventor Charles A. Mathna

Charles A. Mathna 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).

  • Patent number: 6090461
    Abstract: A sheet material for mounting on a substrate such as a wall, and displaying an article such as a greeting card, comprising a film backing, a first repositionable adhesive coating on one surface, and a second repositionable coating on the other surface. The sheet material permits the article to be adhered to, repositioned on, and removed from the sheet material without removing the sheet material from the substrate to which it has been adhered.
    Type: Grant
    Filed: September 11, 1992
    Date of Patent: July 18, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: John W. Frank, Charles A. Mathna
  • Patent number: 5876817
    Abstract: Described is an adhesive clip including a back sheet with a first layer of removable pressure sensitive adhesive on its front major surface, and a second layer of removable pressure sensitive adhesive on its rear surface; and a front sheet of polymeric material having a size adapted to at least overlay the first layer of removable pressure sensitive adhesive on the back sheet which has a first edge attached to the back sheet with the front sheet overlying the first layer of removable pressure sensitive adhesive. When the back sheet is adhered to a planar substrate by the second layer of pressure sensitive adhesive, the front sheet can be pivoted away from the back sheet a distance affording positioning an edge portion of a sheet to be supported between the front sheet and the first layer of pressure sensitive adhesive and pressing of that portion of the sheet to be supported into engagement with the first layer of pressure sensitive adhesive so that the sheet will be supported along the substrate.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: March 2, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Charles A. Mathna, Mark E. Reeves
  • Patent number: 4729518
    Abstract: A tape dispenser comprising a housing including a hub, a roll of tape journaled on the hub and a length of low tack pressure sensitive adhesive coated tape wound around the core. A paper backcard disposed around one end of the hub includes a plurality of generally triangular projecting portions projecting between the hub and the core to provide a friction brake therebetween restricting rotation of said hub to an extent that will prevent unwanted rotation of the hub and uncoiling of the tape when it is withdrawn from the dispenser.
    Type: Grant
    Filed: August 27, 1986
    Date of Patent: March 8, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Charles A. Mathna, Susan M. Butzer
  • Patent number: 4407932
    Abstract: Method of preparing a fade-resistant and abrasion-resistant colored photographic image and a novel color photographic paper therefor. A photograph on the paper is coated with adhesive, bonded to a substrate and the paper backing stripped away, leaving a low density polyethylene foil covering the reversed image.
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: October 4, 1983
    Assignee: Minnesota Mining & Manufacturing Co.
    Inventors: Harry A. Loder, Charles A. Mathna
  • Patent number: 4049483
    Abstract: A hot melt adhesive system which has pressure-sensitive adhesive characteristics at room temperature comprising a heat-activatable hot melt adhesive containing therein inherently tacky elastomeric copolymer microspheres.
    Type: Grant
    Filed: November 18, 1976
    Date of Patent: September 20, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Harry A. Loder, Charles A. Mathna
  • Patent number: D542022
    Type: Grant
    Filed: August 30, 2005
    Date of Patent: May 8, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Wayne K. Dunshee, Amy J. Krohn, Charles A. Mathna