Patents by Inventor Lawrence M. Clemens

Lawrence M. Clemens 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).

  • Polyurethane-based adhesives, systems for such adhesives, articles therefrom, and methods of making
    Patent number: 6642304
    Abstract: Polyurethane-based adhesives of the invention comprise the reaction product of: an isocyanate-reactive component comprising at least two isocyanate-reactive materials, the at least two isocyanate-reactive materials comprising a first isocyanate-reactive material having a weight average molecular weight of less than 2,000 and a second isocyanate-reactive material having a weight average molecular weight of 2,000 or more; an isocyanate-functional component; an optional reactive emulsifying compound; and an optional chain extending agent. The adhesives, which are preferably pressure-sensitive adhesives, can be prepared from 100% solids, waterborne or solventborne systems.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: November 4, 2003
    Assignee: 3M Innovative Properties Company
    Inventors: Richard G. Hansen, Lawrence M. Clemens
  • Polyurethane-based pressure-sensitive adhesives, systems for such adhesives, articles therefrom, and methods of making
    Patent number: 6518359
    Abstract: Polyurethane-based pressure-sensitive adhesives (PSAs) of the invention comprise the reaction product of: a polyol component comprising at least one diol having a weight average molecular weight of at least about 2,000, wherein the at least one diol comprises less than about 8 weight % monols; an isocyanate-functional component; an optional reactive emulsifying compound; and an optional chain extending agent. The PSAs can be prepared from 100% solids, waterborne or solventborne systems.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: February 11, 2003
    Assignee: 3M Innovative Properties Co.
    Inventors: Lawrence M. Clemens, Richard G. Hansen
  • Polysiloxane-grafted copolymer release coating sheets and adhesive tapes
    Patent number: 4728571
    Abstract: Release coating compositions comprising polysiloxane-grafted copolymer and blends thereof with other polymeric materials on sheet materials and the back side of adhesive tapes are provided. Controlled and predictable release is achieved through variation of the number and the length, e.g., the molecular weight, of polysiloxane grafts in the copolymer.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: March 1, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Lawrence M. Clemens, Steven S. Kantner, Mieczyslaw Mazurek
  • Waste water treatment by chelation-gelation
    Patent number: 4379763
    Abstract: Contaminant components in waste water are complexed with a chelating agent and the complexed component is gelled with a polyurethane prepolymer to provide a gelled mass.
    Type: Grant
    Filed: October 15, 1980
    Date of Patent: April 12, 1983
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Lawrence M. Clemens, Alton J. Gasper
  • Polyester-film backed magnetic recording tape having epoxy subbing layer
    Patent number: 4210703
    Abstract: Cationically polymerized epoxy resin subbing layer for the magnetizable and the backside coating, if any, of polyester-film-backed magnetic recording tape acts as a barrier against extraction and migration of low-molecular-weight components of the polyester film backing which otherwise would tend to crystallize on the surface of the magnetizable coating.
    Type: Grant
    Filed: January 11, 1979
    Date of Patent: July 1, 1980
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: William M. Scantlin, Lawrence M. Clemens
  • Acrylic-type pressure sensitive adhesives by means of ultraviolet radiation curing
    Patent number: 4181752
    Abstract: Process for the preparation of a normally-tacky pressure-sensitive adhesive which comprises subjecting a solventless radiation-sensitive acrylate-containing polymerizable mass to radiation in the near UV region, at a rate of from about 0.1 to 7 milliwatts per square centimeter of the mass exposed.
    Type: Grant
    Filed: September 25, 1978
    Date of Patent: January 1, 1980
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John A. Martens, Lawrence M. Clemens, Alvin R. Zigman
  • Resinous repair pad
    Patent number: 4012553
    Abstract: An adherent reinforced resinous pad, consisting of a fibrous mat or fabric impregnated with a soft sticky resinous composition which hardens on exposure to ultraviolet radiation, enclosed between removable protective coverings. Resin flow is inhibited, without destroying adhesion, by controlled gelatinization.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: March 15, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Lawrence M. Clemens