Patents by Inventor David P. Colvin

David P. Colvin 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: 6938290
    Abstract: Impact energy forces to the spine are reduced through the use of multiple overlying pliable impact energy absorbing layers. Each layer comprises a plurality of cells that are in fluid communication which provides for a valved transfer of fluid between the cells. Additionally, each layer has a different durometer.
    Type: Grant
    Filed: April 21, 2003
    Date of Patent: September 6, 2005
    Inventors: Richard A. McKinney, Barbara J. McKinney, David P. Colvin
  • Publication number: 20030204913
    Abstract: Impact energy forces to the spine are reduced through the use of multiple overlying pliable impact energy absorbing layers. Each layer comprises a plurality of cells that are in fluid communication which provides for a valved transfer of fluid between the cells. Additionally, each layer has a different durometer.
    Type: Application
    Filed: April 21, 2003
    Publication date: November 6, 2003
    Inventors: Richard A. McKinney, Barbara J. McKinney, David P. Colvin
  • Patent number: 6418832
    Abstract: A body armor system having improved impact energy absorbing characteristics includes a projectile penetrant inhibiting layer and an impact energy absorbing layer positioned in overlying relation to one side of the projectile penetrant inhibiting layer such that the impact energy absorbing layer is adapted to absorb the impact energy from an incoming projectile. The impact energy absorbing layer spreads at least a portion of the impact energy in the plane of the impact energy absorbing layer. An anti-spalling layer is positioned on the opposite side of the projectile impact inhibiting layer. In another aspect of the invention, the impact energy absorbing layer contains a foam to further enhance impact energy absorption. Additionally, a temperature stabilizing means such as a phase change material is placed within the impact energy absorbing layer and provides thermal regulation.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: July 16, 2002
    Assignee: Pyramid Technologies International, Inc.
    Inventor: David P. Colvin
  • Patent number: 6373058
    Abstract: A method of camouflaging an object emitting infrared radiation by absorbing radiation or by altering its emissive pattern reduces its viewability by an infrared detector. An infrared radiation absorbing and/or altering layer containing microcapsules (10) is positioned proximate the infrared radiation source. The radiation is absorbed by means of a phase change material or plastic crystals. Concentrations and/or phase change materials are varied to enhance camouflage.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: April 16, 2002
    Inventors: Richard A. McKinney, Yvonne G. Bryant, David P. Colvin
  • Patent number: 6298907
    Abstract: A support means or pad which is adapted to overlie an area to be thermally regulated. A plurality of microcapsules are dispersed within the support pad. The support means may be a porous pad or overlying layers of a mesh-type fabric. The fabric sheets include a series of channels which may be zig-zag in shape and are filled with a temperature stabilizing means, for example, a macroencapsulated phase change material. Suitable phase change materials are paraffinic hydrocarbons and water. In another aspect of the invention, the temperature stabilizing means is distributed within the support means in proportion to the underlying thermal load.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: October 9, 2001
    Assignee: Delta Thermal Systems, Inc.
    Inventors: Virginia S. Colvin, David P. Colvin
  • Patent number: 6057266
    Abstract: A mycoherbicide is adapted to be sprayed in solution on to an agricultural property such as seeds, germinating seeds, seedlings or plants and comprises a moisturizer such as water which is microencapsulated for time release on to the surface of agricultural property. In a further embodiment of the invention, a microencapsulated phase change material is also added to the solution to control the temperature on the surface of the agricultural property. A sticker is employed to enhance retention of the microcapsules on the agricultural property. The solution operates to control the microclimate on the surface of the agricultural property in order to enhance the effectiveness of the mycoherbicide fungi or bacteria on the host or to provide frost/freeze protection at low temperatures.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: May 2, 2000
    Assignee: Delta Thermal Systems, Inc.
    Inventors: David P. Colvin, Donald K. Cartwright
  • Patent number: 5804297
    Abstract: A method of insulating a substrate from repeated thermal transients and/or thermal impulses applied thereto by proximately absorbing and storing the thermal transients and/or thermal impulses for subsequent removal by radiation. According to the method, a coating is placed in energy absorbing contacting relation with the substrate. The coating includes a base material and a plurality of microcapsules dispersed within the base material. The microcapsules may be dispersed throughout the base material and may be submerged therein so that they are substantially spaced apart from one another. The microcapsules contain a thermal energy absorbing material, for example, a phase change material such a paraffinic hydrocarbons or alternatively, plastic crystals. Articles of manufacture may be produced according to the present invention which employ the above described coating.
    Type: Grant
    Filed: July 5, 1995
    Date of Patent: September 8, 1998
    Inventors: David P. Colvin, Yvonne G. Bryant, John C. Driscoll, James C. Mulligan
  • Patent number: 5637389
    Abstract: A thermal barrier in the form of a base material with a plurality of microcapsules containing a phase change material forms an insulative pad, such as a shoe insole. The microcapsules are surroundingly encapsulated and embedded within the base material. In addition, substantially all of the microcapsules are spaced apart from each other, the space between neighboring adjacent microcapsules containing a phase change material. The microcapsules may be anisotropically distributed to further reduce thermal conductivity of heat through the thermal barrier.
    Type: Grant
    Filed: March 19, 1996
    Date of Patent: June 10, 1997
    Inventors: David P. Colvin, Yvonne G. Bryant
  • Patent number: 5518802
    Abstract: A cushioning structure for dampening shocks useful as a packing material to protect shipments of goods and as a protective shield or garment to prevent injury from falls or increase comfort such as in shoes, furniture, carpet, automobile components etc. including one or more planar sheets of pliable material bonded to a matrix of polygon shape cells containing a fluid such as air or other gas. In one aspect the cells are in fluid communication with each other to provide a valved fluid transfer from one cell to the next. In another aspect, the material is a resilient material formed as a grid like matrix of shaped indentures.
    Type: Grant
    Filed: April 21, 1994
    Date of Patent: May 21, 1996
    Inventors: David P. Colvin, Craig S. Potter
  • Patent number: 5499460
    Abstract: A thermal barrier in the form of a base material with a plurality of microcapsules containing a phase change material forms an insulative pad, such as a shoe insole. The microcapsules are surroundingly encapsulated and embedded within the base material. In addition, substantially all of the microcapsules are spaced apart from each other, the space between neighboring adjacent microcapsules containing a phase change material. The microcapsules may be anisotropically distributed to further reduce thermal conductivity of heat through the thermal barrier.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: March 19, 1996
    Inventors: Yvonne G. Bryant, David P. Colvin
  • Patent number: 5415222
    Abstract: The invention relates to a cooling garment, preferably in the form of a vest that contains pouches containing a phase change material. The pouches cover less than the surface area of the vest to thereby permit evaporative cooling to occur and to contribute to the overall comfort of the wearer. An alternate embodiment includes a honeycomb structure which is contained within the pouches and which contains a macroencapsulated phase change material and allows the escape of perspiration through the garment. A heat transfer fluid is adapted to circulate throughout the pouches. The honeycomb structure is designed so that the macroencapsulated phase change material remains within designated ones of the honeycombs, but that permits the flow of the heat transfer fluid through the pouch.
    Type: Grant
    Filed: November 19, 1993
    Date of Patent: May 16, 1995
    Assignee: Triangle Research & Development Corporation
    Inventors: David P. Colvin, Yvonne G. Bryant
  • Patent number: 5366801
    Abstract: A coating is adapted to be applied to a fabric in order to enhance the thermal characteristics thereof. The coating includes integral and leak-resistant microcapsules filled with phase change material or plastic crystals that have specific thermal properties at predetermined temperatures.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: November 22, 1994
    Assignee: Triangle Research and Development Corporation
    Inventors: Yvonne G. Bryant, David P. Colvin
  • Patent number: 5290904
    Abstract: A thermal shield comprising first and second substantially flat flame resistant covering layers adapted to overlie each other. A thermal energy absorbing material is positioned between the respective layers in sandwich fashion. The thermal energy absorbing material may comprise a phase change material in bulk, micro or macro encapsulated and which may further be embedded within a base material to provide enhanced thermal protection.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: March 1, 1994
    Assignee: Triangle Research and Development Corporation
    Inventors: David P. Colvin, Yvonne G. Bryant, James C. Mulligan
  • Patent number: 5261394
    Abstract: A percussive aid provides percussive force to aid in the treatment of Cystic Fibrosis and other pulmonary blockage diseases. The device includes a frame with a pair of reciprocating arms mounted thereto at one of their ends. The other end of the arms mount impactor cups. A spring is associated with each of the cups. A drive mechanism is carried by the frame and moves the arms through a predetermined path of travel from a first uncocked position to a second cocked position of maximum deflection wherein the spring is placed in tension when the arm is tripped.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: November 16, 1993
    Assignee: Triangle Research and Development Corporation
    Inventors: James C. Mulligan, David P. Colvin, Virginia S. Colvin, Benjamin T. Gravely, Charles J. Lord, David B. Moody, Raymond A. Whitney, William C. Bryan
  • Patent number: 5224356
    Abstract: A method of using microencapsulated thermal conducting absorbing materials to cool heat sources is disclosed. Also disclosed are microcapsules containing a thermal energy conducting material. According to the method, these materials may be used alone or as a mixture and may be employed as a powder or incorporated into a hardenable matrix such as an epoxy resin.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: July 6, 1993
    Assignee: Triangle Research & Development Corp.
    Inventors: David P. Colvin, Yvonne G. Bryant, James C. Mulligan
  • Patent number: 5148861
    Abstract: A quick disconnect heat exchanger is disclosed wherein male and corresponding female members are adapted to be slidably interconnected. Each of the respective male and female members includes a discrete fluid flow so that fluids are not mixed during heat exchange and the coupler may be disconnected without fluid loss or mixing.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: September 22, 1992
    Assignee: Triangle Research and Development Corporation
    Inventors: David P. Colvin, James C. Mulligan, Benjamin T. Gravely
  • Patent number: 5141079
    Abstract: A method of obtaining enhanced thermal energy between a material forming apparatus and a cooling fluid is disclosed. A two component heat transfer fluid of the type including a carrier fluid and a plurality of discrete particles that undergo a reversible latent energy transition upon the transfer of thermal energy thereto. The temperature of the particles is adjusted (heated or cooled as necessary) to the point of the beginning of latent energy transition of the particles. The fluid is then brought into contact with a heat source such as a metal forming apparatus and a workpiece, proximate the interface therebetween. The slurry may then be collected, adjusted to the point of the beginning of latent energy transition and re-circulated to the heat source.
    Type: Grant
    Filed: July 26, 1991
    Date of Patent: August 25, 1992
    Assignee: Triangle Research and Development Corporation
    Inventors: Raymond A. Whitney, Virginia S. Colvin, David P. Colvin, James C. Mulligan
  • Patent number: 5030501
    Abstract: A cushioning structure for dampening shocks useful as a packing material to protect shipments of goods and as a protective shield or garment to prevent injury from falls including one or more planar sheets of pliable material bonded to a matrix of polygon shape cells containing a fluid such as air or other gas. In one aspect the cells are in fluid communication with each other to provide a valved fluid transfer from one cell to the next.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: July 9, 1991
    Assignee: Raven Marketing, Inc.
    Inventors: David P. Colvin, Craig S. Potter
  • Patent number: 5010892
    Abstract: A body lumen measuring instrument for insertion into a body passageway such as a bronchial tube or the like in order to determine the interior lumen diameter and/or axial length of the passageway at a predetermined location. This instrument can also be used to aid selection of a radioisotope capsule of proper size to be properly positioned at a specific location for tumor treatment. The measuring instrument includes a flexible sleeve having a handle secured to one end. A cable is slidably positioned within the sleeve and secured at one end to a slide actuator within the handle and at the other end terminates in a probe adapted for determining body passageway size under endoscopic observation. A measurement scale is associated with an indicator on the slide actuator in order to display the passageway size.
    Type: Grant
    Filed: May 4, 1988
    Date of Patent: April 30, 1991
    Assignees: Triangle Research and Development Corp., Johns Hopkins University, Medical Evaluation Devices & Instruments Corp.
    Inventors: David P. Colvin, Raymond A. Whitney, Bernard R. Marsh, William M. Kline, Ronald R. Rizzo, Mark E. Orlosky
  • Patent number: 4936823
    Abstract: An implant capsule for insertion into a body canal to apply radiation treatment to a selected portion of the body canal. The device includes a body member defining at least one therapeutic treatment material receiving chamber and at least one resilient arm member associated with the body member for removably engaging the body canal when the device is positioned therein.
    Type: Grant
    Filed: May 4, 1988
    Date of Patent: June 26, 1990
    Assignees: Triangle Research and Development Corp., The Johns Hopkins Univ.
    Inventors: David P. Colvin, Bernard R. Marsh