Patents by Inventor William H. Hartt

William H. Hartt 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).

  • Coextruded mechanical fastener constructions
    Patent number: 6106922
    Abstract: A web of material has a plurality of stems extending from at least one side of the web. The web includes a first layer of material having a first side and a second side and a second layer of material. The second layer of material has a first side which faces the first side of the first layer and a second side from which the plurality of stems extend. The first and second layers of material are joined together while they are both molten, before either layer has cooled. The first and second layers of material can be formed of thermoplastic material or melt processable polymeric material. A method of making a web of material includes selecting a first material for a first layer of material and selecting a second material for a second layer of material. The first and second layers of material are melt formed. Then, the first and second layers of material are joined while the layers are in the molten state to form a multiple layer sheet.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: August 22, 2000
    Assignee: 3M Innovative Company
    Inventors: John E. Cejka, Mark R. Dupre, Jeffrey O. Emslander, William H. Hartt, Robert D. Kampfer, Francis V. Loncar, Jr., Louis S. Moren, Diane L. Regnier, Jayshree Seth, Robert W. G. Shipman, Alan J. Sipinen, William C. Unruh, Dennis G. Welygan, Leigh E. Wood
  • Methods for detection and prevention of concrete cracking and spalling associated with embedded metal corrosion
    Patent number: 5426973
    Abstract: Applicant has discovered a new mechanism which induces the cracking and spalling of metal-reinforced concrete. Methods and compositions for preventing such cracking and spalling are provided. Methods of testing compositions or admixtures for effectiveness in preventing cracking and spalling are also provided.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: June 27, 1995
    Assignee: Florida Atlantic University
    Inventor: William H. Hartt