Patents Represented by Attorney, Agent or Law Firm John A. Burtis
  • Patent number: 6396631
    Abstract: A polarized light source includes a diffuse light source and a reflective polarizing element placed: proximate thereto. The reflective polarizing element transmits light of a desired polarization and reflects light of another polarization back into the diffuse source where it is randomized. Some of the initially rejected light is thus converted into the desired polarization and is transmitted through the reflective polarizing element. This process continues, and the repeated reflections and subsequent randomization of light of the undesired polarization increases the amount of light of the desired polarization that is emitted by the polarized light source.
    Type: Grant
    Filed: June 12, 2000
    Date of Patent: May 28, 2002
    Assignee: 3M Innovative Properties Company
    Inventor: Andrew J. Ouderkirk
  • Patent number: 6391626
    Abstract: Media, devices and methods using ballasted pH indicators to detect and enumerate bacterial colonies in a sample are described. The ballasted pH indicators limit the diffusion of the indicator or fluorescent indicator zones associated with the growing microbial colonies in the medium. In addition, the ballasting of certain typically toxic indicators may render these indicators harmless to bacteria without adversely affecting their pH indicating ability.
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: May 21, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Carl A. Adams, Kurt J. Halverson, Gary E. Krejcarek
  • Patent number: 6354296
    Abstract: A face mask is disclosed that includes a mask portion, a resilient member (e.g., a pillowed web), and, optionally, an adhesive portion. The resilient member and the adhesive portion are alternately positionable between the mask portion and the wearer to inhibit the passage of vapor between the mask and the wearer, which prevents fogging of the wearer's eyewear. A method for using the face mask is also disclosed.
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: March 12, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Nicholas R. Baumann, Shannon L. Dowdell, Matt T. Scholz, Wayne K. Dunshee
  • Patent number: 6355448
    Abstract: A sterilization indicator for testing the effectiveness of a sterilization procedure comprises a source of an enzyme, a sterilant-resistant chemical associated with the enzyme, and a substrate that reacts with the enzyme to form a detectable enzyme-modified product that provides an indication of the failure of the sterilization procedure. The sterilant-resistant chemical may be a polyglycerol alkyl ester, polyglycerol alkyl ether, an ethoxylated polyhydric alcohol ester, or a polyhydric alcohol ether. The indicator may be used to test the effectiveness of a hydrogen peroxide plasma sterilization procedure and may be provided with a non-challenge test pack or a lumen-challenge test pack.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: March 12, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: William E. Foltz, Robert A. Asmus, Ronald G. Lulich
  • Patent number: 6356779
    Abstract: A universally functional biomedical electrode is disclosed, where the electrode has a resistive element that reduces edge effect by a redistribution of current within the electrode and in mammalian tissue contacting the electrode. In one embodiment, the electrode has at its perimeter in one layer the resistive element that provides a cross-sectional area to reduce edge effect regardless of the type of biomedical instrumentation connected thereto. With the construction of other layers suitable for multifunctional electrode usage, this electrode can serve as a single item in inventory at health facilities.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: March 12, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin R. Katzenmaier, Samuel G. Netherly, Hatim M. Carim
  • Patent number: 6352701
    Abstract: Disclosed is a composition including a lower alcohol and water in a weight ratio of about 35:65 to 100:0, between at least 0.5% and 8.0% by weight thickener system comprised of at least two emulsifiers, each emulsifier present in at least 0.05% by weight wherein the composition free of auxiliary thickeners has a viscosity of at least 4,000 centipoise at 23 degrees C. and wherein each emulsifier is comprised of at least one hydrophobic group and at least one hydrophilic group. The composition is useful as a presurgical scrub replacement, a lotion or other hand preparation.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: March 5, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Matthew T. Scholz, Robert A. Asmus, Jill R. Charpentier
  • Patent number: 6352837
    Abstract: A sterilization indicator is useful for testing the effectiveness of sterilization procedures that disinfect objects by contacting them with a liquid sterilization procedure. The indicator includes an outer container having an open end and a cover material associated with the open end that is impermeable to liquids and bacteria. An enzyme-gel matrix is coated on a surface within the outer container that comprises a biologically inert polymeric gel and a source of an active enzyme dispersed within the gel. The enzyme has an activity that is correlated with the survival of at least one test microorganism that is commonly used to monitor the effectiveness of a sterilization procedure. A breakable ampoule within the outer container contains a substrate that is capable of reacting with any active enzyme remaining after the indicator has been subjected to a sterilization procedure to provide a detectable indication that the sterilization procedure was ineffective.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: March 5, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Kelvin J. Witcher, Lewis P. Woodson
  • Patent number: 6346417
    Abstract: A sterilization monitor includes a substrate and an monitor composition. The monitor composition contains a colorant and a halogen source and undergoes a distinct color change when exposed to a peracid. The sterilization monitor can be used to monitor a sterilization process involving a peracid. A sterilization monitoring device, including a sterilization monitor enclosed in a housing having a vapor permeable barrier, can also be used to monitor a sterilization process.
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: February 12, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Ramon T. Ignacio, Allan P. Piechowski
  • Patent number: 6323032
    Abstract: A sterilant challenge device, for use in testing the efficiency of the removal stage of a sterilization cycle in a sterilizer. In a preferred embodiment, the device includes a tube that is closed at one end and open at the other for the entry of sterilant, a plurality of thermally-conductive masses the tube, and at least one temperature sensor. When the challenge device is located in a sterilizer, the penetration of sterilant along the bore of the tube during a sterilization cycle, is inhibited by the accumulation of air and/or non-condensable gas within the bore resulting from the condensation of moisture on the walls of the bore. By measuring the temperature inside the device adjacent the closed end of the tube, the efficiency of the sterilization cycle can be determined.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: November 27, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Anton Kuepper, Brian Kirk
  • Patent number: 6307676
    Abstract: An optical device includes a dichroic polarizer and a multilayer optical film, such as a reflective polarizer or mirror. The multilayer optical film is made using polymers which may allow for the simultaneous orientation of the dichroic and reflective polarizers. The multilayer optical film often contains a set of birefringent first layers and a set of second layers, which may have an isotropic index of refraction. The dichroic polarizers is a polyvinyl alcohol film with a dichroic dye. The multilayer optical film and dichroic polarizer can be stretched at temperatures of 130° C. or less to orient the two films without substantial cracking of the dichroic polarizer. When an optional second polymer is combined with the polyvinyl alcohol, the multilayer optical film and dichroic polarizer can be stretched at temperatures of about 160° C. without substantial cracking of the dichroic polarizer.
    Type: Grant
    Filed: July 10, 2000
    Date of Patent: October 23, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: William W. Merrill, Timothy J. Hebrink, Brian H. Williams, William L. Kausch
  • Patent number: 6287518
    Abstract: A sterilization monitor includes a substrate and an monitor composition. The monitor composition contains a colorant and a halogen source and undergoes a distinct color change when exposed to a peracid. The sterilization monitor can be used to monitor a sterilization process involving a peracid. A sterilization monitoring device, including a sterilization monitor enclosed in a housing having a vapor permeable barrier, can also be used to monitor a sterilization process.
    Type: Grant
    Filed: February 5, 1998
    Date of Patent: September 11, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Ramon T. Ignacio, Allan P. Piechowski
  • Patent number: 6286511
    Abstract: An ophthalmic surgical drape and a method of applying the drape to a patient. The ophthalmic surgical drape is made from a sheet having an aperture in the interior of the sheet, and at least two tear lines in the sheet extending from the aperture. The drape also has a field of skin compatible adhesive adjacent the aperture, with the field being traversed by the tear lines so as to divide the field into at least two portions. The drape may be provided in a folded condition in which tearing can be accomplished so as to divide the drape into two sections before the drape is unfolded. Also disclosed are two tear lines disposed along an oblique angle, and a method of applying the drape.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: September 11, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Yolla B. Levitt, Dennis L. Baker, Robert A. Davis, Camille M. Hildebrandt, Mary K. Reed
  • Patent number: 6268961
    Abstract: An optical film includes a reflective polarizing element and a particle-containing layer. The reflective polarizing element substantially reflects light having a first polarization state and substantially transmits a second polarization state. The particle-containing layer is disposed on the reflective polarizing element and in a same optical path as the reflective polarizing element. The particle-containing layer is configured and arranged to transmit light and includes a plurality of particles that roughen an exterior surface of the optical film. Preferably, using the optical film in an optical device does not substantially reduce the gain advantage of the optical device when compared with an optical device utilizing the same optical film without particles in the surface layer. Also described are optical devices using the optical film and methods of making and using the optical films.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: July 31, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Timothy J. Nevitt, Carl A. Stover, William L. Kausch, Guy M. Kallman, Robert W. Horn, Timothy J. Hebrink, James A. Olson, Mark B. O'Neill, Elisa M. Cross, Susan L. Kent
  • Patent number: 6262180
    Abstract: This invention describes hydrophobic and oleophobic fibers, films and molded articles comprising synthetic organic polymer wherein dispersed within the fiber, fabric or molded article and present at the surface of the fiber, fabric or molded article are fluorochemical compounds. Method of preparing such fibers, films and molded articles, as well as articles made therefrom also are disclosed.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: July 17, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas P. Klun, Alton J. Gasper, John A. Temperante
  • Patent number: 6248085
    Abstract: An apparatus or kit for applying a predictable amount of liquid such as a surgical prepping solution to an applicator having a resilient, porous pad. The apparatus includes a receptacle having an internal space such that when the pad is placed within the space, the pad is compressed to a predetermined degree. The receptacle is attached to a bottle or other container holding surgical prepping solution. In one embodiment, a dip tube extends from an inlet near the bottom of the bottle to an outlet positioned within the internal space of the receptacle. Most preferably, the outlet extends into the internal space of the receptacle. Pressurizing the bottle dispenses liquid through the dip tube onto the applicator. A method of use of the kit or apparatus is also disclosed.
    Type: Grant
    Filed: January 26, 1999
    Date of Patent: June 19, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Matthew T. Scholz, Dennis L. Baker, Robert P. Zaspel, Jon A. Kirschhoffer, Maurice H. Kuypers
  • Patent number: 6238623
    Abstract: A novel label may be used in a novel sterilization tracking system. The label preferably has first and second portions and a first and second liners. Perforations may preferably attach the first portion to the second portion. The label is particularly suitable for use in monitoring and/or tracking hydrogen peroxide sterilization procedures.
    Type: Grant
    Filed: February 5, 1998
    Date of Patent: May 29, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Anita Amhof, Urs Jauslin, Ramon T. Ignacio, Florian Weinig, Christian Stoop
  • Patent number: 6232366
    Abstract: A skin-compatible, hot-melt processible, pressure sensitive adhesive is disclosed. A thermo-reversible cross-linking is achieved, permitting advantages in processibility and the reduction of waste.
    Type: Grant
    Filed: June 9, 1999
    Date of Patent: May 15, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: DanLi Wang, Peter A. Stark, Albert I. Everaerts
  • Patent number: 6224949
    Abstract: In one aspect the invention provides an energy efficient polymerization method comprising irradiating a polymerizable composition and a photoinitiator with a source of essentially monochromatic radiation where the photoinitiator and the wavelength of the radiation source are selected such that the extinction coefficient of the photoinitiator at the peak wavelength of the source is greater than about 1000 M−1 cm−1 and such that the photoinitiator absorbs at least two percent of the actinic radiation incident on the coating. In another aspect the invention provides energy efficient methods of polymerizing polymerizable compositions and crosslinking crosslinkable compositions by irradiating the respective compositions with a low power source of essentially monochromatic radiation. The low power energy sources have an input power of less than about 10 W/cm.
    Type: Grant
    Filed: June 11, 1998
    Date of Patent: May 1, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Robin E. Wright, George F. Vesley
  • Patent number: 6210785
    Abstract: Optical devices such as light pipes which incorporate multilayer optical films in which the refractive indices of two adjacent layers in the thickness direction are substantially matched or are small relative to the difference in refractive indices of said two adjacent layers in an given in-plane direction which is at least 0.05. The multilayer optical film exhibits low absorptivity and can reflect light approaching at shallow angles as well as normal to the film.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: April 3, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Michael F. Weber, David L. Wortman, Andrew J. Ouderkirk, Sanford Cobb, Jr.
  • Patent number: D457244
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: May 14, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Nicolaus Loutis, Paul Weidenhaupt