Patents by Inventor George H. Crawford

George H. Crawford 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: 5415993
    Abstract: A photographic emulsion containing: a photosensitive silver halide; a light-insensitive, reducible silver source; a reducing agent for the light-insensitive, reducible silver source; and a binder consisting essentially of poly(vinyl butyral) having a poly(vinyl alcohol) content of about 17.5 to 21.0 wt. % and at least one solvent selected from the group consisting of: toluene, methyl ethyl ketone, acetone, tetrahydrofuran, and 1,4-dioxane. Additionally, a process for coating a substrate involving applying at least one layer of a molten thermoreversible organogel layer; causing it to gel; and removing residual solvent.
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: May 16, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Kenneth L. Hanzalik, George H. Crawford, Jr., Sharon M. Rozzi, David J. Scanlan
  • Patent number: 5378542
    Abstract: Process for the simultaneous application of at least two molten, thermoreversible organogel layers to a substrate. The organogel layers can optionally contain dispersed additive ingredients, such as pigments. The organogel layers are coated onto a suitable substrate and then rapidly cooled or chilled to form a gel. Residual solvent is then removed. Multilayer coated films are thus formed with minimal interlayer mixing or interlayer diffusion of the additive ingredients.
    Type: Grant
    Filed: June 6, 1994
    Date of Patent: January 3, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Kenneth L. Hanzalik, George H. Crawford, Jr., Sharon M. Rozzi, David J. Scanlan
  • Patent number: 5340613
    Abstract: Process for the simultaneous application of at least two molten, thermoreversible organogel layers to a substrate. The organogel layers can optionally contain dispersed additive ingredients, such as pigments. The organogel layers are coated onto a suitable substrate and then rapidly cooled or chilled to form a gel. Residual solvent is then removed. Multilayer coated films are thus formed with minimal interlayer mixing or interlayer diffusion of the additive ingredients.
    Type: Grant
    Filed: March 12, 1993
    Date of Patent: August 23, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Kenneth L. Hanzalik, George H. Crawford, Jr., Sharon M. Rozzi, David J. Scanlan
  • Patent number: 4430366
    Abstract: Most processes for the generation of metal oxide or metal sulfide films involved oxidation of existing metal layers or direct vapor deposition of the oxide or sulfide layer. These processes do not provide efficient control of film integrity, optical properties, and bonding. The use of a metal vapor deposition process in which a controlled amount of oxygen or sulfur containing gas or vapor is introduced into the metal vapor stream or portions enables formation of metal oxide or metal sulfide films with excellent control over the film properties.
    Type: Grant
    Filed: October 20, 1982
    Date of Patent: February 7, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: George H. Crawford, Edward J. Downing, Roy G. Schlemmer
  • Patent number: 4387156
    Abstract: Imaging materials are disclosed which comprise a substrate having a metal/ (metal oxide or sulfide) coating with an optical density of at least 0.2 on one surface of the substrate and a photoresist layer over said coating.
    Type: Grant
    Filed: February 4, 1981
    Date of Patent: June 7, 1983
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: George H. Crawford, Richard S. Fisch
  • Patent number: 4364995
    Abstract: Most processes for the generation of metal oxide or metal sulfide films involved oxidation of existing metal layers or direct vapor deposition of the oxide or sulfide layer. These processes do not provide efficient control of film integrity, optical properties, and bonding. The use of a metal vapor deposition process in which a controlled amount of oxygen or sulfur containing gas or vapor is introduced into the metal vapor stream or portions enables formation of metal oxide or metal sulfide films with excellent control over the film properties.
    Type: Grant
    Filed: February 4, 1981
    Date of Patent: December 21, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: George H. Crawford, Edward J. Downing, Roy G. Schlemmer
  • Patent number: 4009313
    Abstract: A self-supporting, non-woven composite web is described which is readily dispersible in aqueous media containing enzymes. The web comprises intersecting randomly or partially oriented fibers and has low wet-strength in the absence of a binder, the fibers being bonded in web form by a polymeric binder which is attacked and disintegrated by enzymes, thus permitting the fibers to disperse rapidly in aqueous milieu containing enzymes. The webs of the invention are useful for production of articles useful for absorbing body wastes, e.g. diapers, bandages, etc.
    Type: Grant
    Filed: August 30, 1972
    Date of Patent: February 22, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: George H. Crawford, Charles F. Nawrot, Ronald F. Ofstead
  • Patent number: 4008350
    Abstract: A padded stocking, suitable as footwear in conjunction with a ski boot or the like, is provided comprising a stocking having affixed to the ankle and shin region thereof a conformable layer of a visco-elastic material, such as a flexible open-cell polyurethane foam impregnated with an acrylic resin, which functions as a padding, said conformable layer having retarded deformation and recovery characteristics such that said layer with a thickness of at least 1/8 inch has a compression modulus of 1 to 15 pounds per square inch when measured at a deformation rate of 2 inches per minute and a plot of said compression modulus versus time yields a curve with a slope of -0.3 to -2.0 pounds per square inch per second when said layer is compressed at deformation rates of 2 to 20 inches per minute.
    Type: Grant
    Filed: August 31, 1972
    Date of Patent: February 15, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: George H. Crawford, Howell K. Smith, II
  • Patent number: 4003941
    Abstract: A process for the production of polyhalocarbon oxides not requiring the use of light is disclosed. This process involves introducing into a reaction zone perhaloolefin and ozone. The polymers obtained are substantially free of oxidizing linkages. The polyhalocarbon oxides and hydrolyzed products obtained therefrom are useful as intermediates for stabilized materials useful, for instance, as heat transfer media and lubricants, and for cured materials useful, for instance, in sealant systems and adhesive systems.
    Type: Grant
    Filed: May 16, 1973
    Date of Patent: January 18, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: George H. Crawford, Nicholas Kowanko