Patents by Inventor Walton J. Hammar

Walton J. Hammar 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: 6196730
    Abstract: A curable adhesive composition for forming a bond between silicone coated optical fibers and fiber connector bodies, said composition comprising: an epoxy resin component; and a curative admixed therewith. The curative comprises an amino-substituted polysiloxane including more than one primary amino group and having a molecular weight from about 150 to about 1,000. The adhesive composition has an initial viscosity, before curing, below about 100 Pascal-seconds, and the bond has a fiber pull-out force above about 1 Kg. Also provided is fiber optic connector including a holder for one or more optical cables, each optical cable having an optical fiber surrounded by strengthening fibers, both of which are surrounded by at least one polymeric coating layer wherein the optical cable is bonded to the connector by means of the curable adhesive.
    Type: Grant
    Filed: June 22, 1998
    Date of Patent: March 6, 2001
    Assignee: 3M Innovative Properties Company
    Inventor: Walton J. Hammar
  • Patent number: 6045648
    Abstract: Multilayered film and film based assembly which are environmentally-compatible, and which exhibit one or more desirable characteristics of polyvinyl chloride (PVC) film and film based assemblies, such as clarity, flexibility and toughness, but without the environmental and health hazards associated with PVC materials, are provided. Also provided is a method of preparing such film and film based assembly.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: April 4, 2000
    Assignee: Minnesta Mining and Manufacturing Company
    Inventors: Charlotte M. Palmgren, Craig S. Chamberlain, Ching-Long Tsai, Daryl D. Dressler, Jon M. Nornberg, Dan L. Fanselow, Raymond L. Ferguson, Walton J. Hammar
  • Patent number: 5766744
    Abstract: Multilayered film and film based assembly which are environmentally-compatible, and which exhibit one or more desirable characteristics of polyvinyl chloride (PVC) film and film based assemblies, such as clarity, flexibility and toughness, but without the environmental and health hazards associated with PVC materials, are provided. Also provided is a method of preparing such film and film based assembly.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: June 16, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dan L. Fanselow, Raymond L. Fergusen, Walton J. Hammar, Lester B. Odegaard
  • Patent number: 5712044
    Abstract: Multilayered film and film based assembly which are environmentally-compatible, and which exhibit one or more desirable characteristics of polyvinyl chloride (PVC) film and film based assemblies, such as clarity, flexibility and toughness, but without the environmental and health hazards associated with PVC materials, are provided. Also provided is a method of preparing such film and film based assembly.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: January 27, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dan L. Fanselow, Raymond L. Ferguson, Walton J. Hammar, Lester B. Odegaard, Daryl D. Dressler, Jon M. Nornberg, Ching-Long Tsai, John H. Ko, Craig S. Chamberlain, Charlotte M. Palmgren
  • Patent number: 5562127
    Abstract: Multilayered tubing which exhibits one or more desirable characteristics of polyvinyl chloride (PVC) tubings, such as clarity, flexibility and toughness, but without the environmental and health hazards associated with PVC materials, is provided. Also provided is a method of preparing such tubing.
    Type: Grant
    Filed: July 18, 1995
    Date of Patent: October 8, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dan L. Fanselow, Walton J. Hammar, John H. Ko, James C. Margl, Debra L. Wilfong
  • Patent number: 5117304
    Abstract: The present invention provides improved, flexible retroreflective articles based upon an optically clear, aliphatic polyurethane polymer. The aliphatic polymer has a plurality of hard chain segments of the formula--C(O)N(H)--C.sub.6 H.sub.10 --N(H)C(O)--.
    Type: Grant
    Filed: September 21, 1990
    Date of Patent: May 26, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Tzu-Li J. Huang, Walton J. Hammar, James C. Coderre, Mirian D. Nave
  • Patent number: 4948859
    Abstract: Bulk polymerization process for making radiation curable polyurethanes which comprises:(A) providing the following raw materials:(1) diisocyanate;(2) oligomeric diol>400 molecular weight; and(3) >1 chain extending monomer;(B) reacting the raw materials in a twin screw extruder under the following conditions:(1) molar ratio of isocyanate to hydroxy moieties of about 1;(2) ratio of chain extending monomer to other monomers sufficient to yield a polymer having chain extender incorporated at 0.1 to 10 weight percent;(3) extruder temperature sufficient to initiate and maintain reaction; and(4) residence time sufficient to obtain substantially complete reaction of diisocyanate;(C) cooling product polymer. Polyurethane product has weight average molecular weight greater than 80,000 and acrylate or methacrylate functionality. Process permits continuous production of radiation curable polyurethanes having narrow molecular weight distribution and high tensile strength.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: August 14, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jimmie L. Echols, Walton J. Hammar, Thomas A. Kotnour
  • Patent number: 4675320
    Abstract: Antimicrobial 2-nitro-3-phenylbenzofurans wherein the benzo or the 3-phenyl portion of the molecule is bonded to an alkylene or an oxyalkylene group which is in turn bonded to a basic nitrogen atom or to the nitrogen atom of an (N-lower alkanoyl)amino group.
    Type: Grant
    Filed: May 15, 1985
    Date of Patent: June 23, 1987
    Assignee: Riker Laboratories, Inc.
    Inventors: Robert A. Scherrer, Richard M. Stern, Walton J. Hammar
  • Patent number: 4526896
    Abstract: Antimicrobial 2-nitro-3-phenylbenzofurans wherein the benzo or the 3-phenyl portion of the molecule is bonded to an alkylene or an oxyalkylene group which is in turn bonded to a basic nitrogen atom or to the nitrogen atom of an (N-lower alkanoyl)amino group.
    Type: Grant
    Filed: March 5, 1981
    Date of Patent: July 2, 1985
    Assignee: Riker Laboratories, Inc.
    Inventors: Robert A. Scherrer, Richard M. Stern, Walton J. Hammar
  • Patent number: 4326532
    Abstract: A medical article having a layered antithrombogenic surface is useful as a polymeric implant. The article comprises a polymeric substrate coated with chitosan to which is appended an antithrombotic agent. A process for rendering the surface of a polymer antithrombogenic is disclosed.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: April 27, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Walton J. Hammar
  • Patent number: 4275221
    Abstract: Compounds wherein 2-nitrobenzofuran is substituted by one or two phenyl groups and certain other substituents which are active as antimicrobial agents, processes for their use and intermediates therefor.
    Type: Grant
    Filed: January 21, 1980
    Date of Patent: June 23, 1981
    Assignee: Riker Laboratories, Inc.
    Inventors: Walton J. Hammar, Mark A. Rustad
  • Patent number: 4258213
    Abstract: Compounds wherein 2-nitrobenzofuran is substituted by one or two phenyl groups and certain other substituents which are active as antimicrobial agents, processes for their use and intermediates therefor.
    Type: Grant
    Filed: January 21, 1980
    Date of Patent: March 24, 1981
    Assignee: Riker Laboratories, Inc.
    Inventors: Walton J. Hammar, Mark A. Rustad
  • Patent number: 4247469
    Abstract: Compounds wherein 2-nitrobenzofuran is substituted by one or two phenyl groups and certain other substituents which are active as antimicrobial agents, a processes for their use and intermediates therefor.
    Type: Grant
    Filed: January 21, 1980
    Date of Patent: January 27, 1981
    Assignee: Riker Laboratories, Inc.
    Inventors: Walton J. Hammar, Mark A. Rustad
  • Patent number: 4246179
    Abstract: Compounds wherein 2-nitrobenzofuran is substituted by one or two phenyl groups and certain other substituents which are active as antimicrobial agents, processes for their use and intermediates therefor.
    Type: Grant
    Filed: January 21, 1980
    Date of Patent: January 20, 1981
    Assignee: Riker Laboratories, Inc.
    Inventors: Walton J. Hammar, Mark A. Rustad
  • Patent number: 4209633
    Abstract: The maleic acid adduct of anthracene is used as a starting material for 11-amino-12-carboalkoxy-9,10-dihydro-9,10-ethanoanthracene, which through reaction with nitrous acid in a protic solvent provides an 11-substituted-12-carboalkoxy-10,11-dihydro-5,10-methano-5H-dibenzo[a,d]cy cloheptene which is then converted into the useful intermediate 12-carboxy-10,11-dihydro-5,10-methano-5H-dibenzo[a,d]cycloheptene.
    Type: Grant
    Filed: April 17, 1978
    Date of Patent: June 24, 1980
    Assignee: Riker Laboratories, Inc.
    Inventor: Walton J. Hammar
  • Patent number: 4208335
    Abstract: Acidic 2-nitro-3-phenylbenzofurans and their pharmaceutically acceptable salts which are active as antimicrobial agents, processes for their use and intermediates therefor are described.
    Type: Grant
    Filed: December 20, 1978
    Date of Patent: June 17, 1980
    Assignee: Riker Laboratories, Inc.
    Inventors: Robert A. Scherrer, Walton J. Hammar, Richard M. Stern
  • Patent number: 4208337
    Abstract: Compounds wherein 2-nitrobenzofuran is substituted by one or two phenyl groups and certain other substituents which are active as antimicrobial agents, processes for their use and intermediates therefor.
    Type: Grant
    Filed: February 21, 1979
    Date of Patent: June 17, 1980
    Assignee: Riker Laboratories, Inc.
    Inventors: Walton J. Hammar, Mark A. Rustad
  • Patent number: 4172205
    Abstract: Compounds wherein a phenylalkanoic acid is substituted by a 2-nitro-3-phenylbenzofuran group which are active as antimicrobial agents, processes for their use and intermediates therefor are described.
    Type: Grant
    Filed: December 20, 1978
    Date of Patent: October 23, 1979
    Assignee: Riker Laboratories, Inc.
    Inventors: Walton J. Hammar, Mark A. Rustad
  • Patent number: 4153716
    Abstract: Compounds wherein 2-nitro-3-phenylbenzofuran is substituted by one or two alcohol or thioalcohol-containing functional groups, or derivatives thereof, are active as antimicrobial agents.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: May 8, 1979
    Assignee: Riker Laboratories, Inc.
    Inventors: Robert A. Scherrer, Walton J. Hammar, Richard M. Stern
  • Patent number: 4153721
    Abstract: Compounds wherein 2-nitrobenzofuran is substituted by one or two phenyl groups and certain other substituents which are active as antimicrobial agents, processes for their use and intermediates therefor.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: May 8, 1979
    Assignee: Riker Laboratories, Inc.
    Inventors: Walton J. Hammar, Mark A. Rustad