Patents Assigned to Conwed Corporation
  • Patent number: 4083273
    Abstract: Method and apparatus for punching holes in continuously moving board material are disclosed. The holes may be decorative or functional and are punched so that no or negligible elongation results. The board is continuously moved in a first direction at a first speed and at least one member having pins or other projections thereon is rotated simultaneously about two axes at angular speeds such that the pins contact and punch the board during a portion of the rotation of the member while the speed of the member and the first speed are approximately equal and with the projections being in an essentially predetermined orientation to the board. Since the projections are oriented with respect to the board and are moving at approximately the same speed as the board while they contact and punch the board, there will be no or negligible elongation of the punched holes.
    Type: Grant
    Filed: December 8, 1976
    Date of Patent: April 11, 1978
    Assignee: Conwed Corporation
    Inventors: Theodore E. Hillman, Mark D. Belcher
  • Patent number: 4073230
    Abstract: A method for surface embossing mineral fiber sheets, comprising mineral fibers, perlite and binders, is disclosed. A liquid, preferably water, is sprayed on the surface of the board to be embossed and the wet surface is compressed at an elevated temperature of from 550.degree. to 750.degree. F for about 0.1 to about 2 seconds. The elevated temperature rapidly forms steam which penetrates the sheet surface to be embossed by the simultaneous application of pressure.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: February 14, 1978
    Assignee: Conwed Corporation
    Inventor: David W. Akerson
  • Patent number: 4072558
    Abstract: A process for preparing a non-combustible hardboard sheet is disclosed. The process comprises the formation of relatively low density insulation board type product which is dried, whereafter the board is wetted on both sides and compressed at relatively high temperatures to form a dense non-combustible hardboard product.
    Type: Grant
    Filed: February 16, 1977
    Date of Patent: February 7, 1978
    Assignee: Conwed Corporation
    Inventor: David W. Akerson
  • Patent number: 4062721
    Abstract: A surfactant foaming agent added to a wet fibrous sheet just before initiation of vacuum water extraction forms foam within the sheet. The foam expels water from the sheet while increasing the resistance to vacuum. Water removal time is lengthened and the fractional amount of water removed by suction is increased. The reduced residual water provides a proportional decrease in drying time and drying energy.The addition of an anti-foaming agent with the surfactant reduces the water drainage time as compared to the normal case. This increases the drainage rate but does not increase the amount of water drained from the sheet.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: December 13, 1977
    Assignee: Conwed Corporation
    Inventors: Vernon L. Guyer, David O. Bringen
  • Patent number: 4057123
    Abstract: A lightweight sound absorbing panel is disclosed. The panel comprises front and rear faces mounted to a supporting frame and having a core therebetween. The core is at least partially free airspace throughout a substantial portion of the area of the panel whereby weight reduction and increased sound absorption are obtained.
    Type: Grant
    Filed: December 3, 1975
    Date of Patent: November 8, 1977
    Assignee: Conwed Corporation
    Inventor: Gordon A. Erickson
  • Patent number: 4037499
    Abstract: A method and apparatus for perforating and, if desired, eroding fibrous board surfaces in a non-repetitive pattern are disclosed. The boards perforated according to the present invention are especially useful as acoustical tiles and panels. The board is formed and dried with a surface pattern developed on the board surface if desired and thereafter the board surface is punched by a series of randomly arranged pins or tacks on a plurality of rolls whereby a non-repetitive pattern results.
    Type: Grant
    Filed: January 26, 1974
    Date of Patent: July 26, 1977
    Assignee: Conwed Corporation
    Inventor: Theodore E. Hillman
  • Patent number: 4038008
    Abstract: An apparatus for the production of perforated tubular film i.e., net is disclosed. A tube of a thermosetting polymer is continuously extruded and the extrusion opening is alternately interrupted first from one side of the tube and then from the other thereby doubling the capacity of the machine.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: July 26, 1977
    Assignee: Conwed Corporation
    Inventor: Ronald Leslie Larsen
  • Patent number: 4027580
    Abstract: A method and apparatus for stacking in precise alignment relatively large, flat, lightweight and flexible objects such as low density felted, fiber pads are disclosed. The disclosed method comprises the steps of feeding the pads towards the stack, rotating the leading edge of a pad to be stacked approximately 180.degree. to place the leading edge of the pad at the top of the stack in a position reversed top-bottom due to the rotation, and causing the remaining portion of the pad to follow in the position reversal along the top of the stack.
    Type: Grant
    Filed: November 21, 1975
    Date of Patent: June 7, 1977
    Assignee: Conwed Corporation
    Inventor: George Holger Sundin
  • Patent number: 4024014
    Abstract: A process for preparing a non-combustible hardboard sheet is disclosed. The process comprises the formation of relatively low density insulation board type product which is dried, whereafter the board is wetted on both sides and compressed at relatively high temperatures to form a dense non-combustible hardboard product.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: May 17, 1977
    Assignee: Conwed Corporation
    Inventor: David Wallace Akerson
  • Patent number: 4016678
    Abstract: A seedling transplant container is disclosed. The container is a net-like tube preferably with an open bottom and having one set of strands which is of substantially greater strength (at least 25% and preferably 50%) than the other set of strands so that the container can be machine planted but yet easily ruptured by the growing plant.
    Type: Grant
    Filed: May 5, 1975
    Date of Patent: April 12, 1977
    Assignee: Conwed Corporation
    Inventor: Ronald Leslie Larsen
  • Patent number: 3998006
    Abstract: A dark perforated flexible plastic sheet bonded on top of a fertilizer-containing cellulosic fiber blanket in contact with the earth shields the blanket and the soil beneath from the drying effects of the free circulation of air while allowing entry of water. The fiber blanket is composed of cellulosic fiber mat. The fiber mat rests upon the ground thereby discouraging growth in the areas of contact. Spaces for plant growth are provided between adjacent areas of fiber blanket. Plant growth is encouraged in these spaces by the absorption of solar energy by the plastic film transmitted to the earth beneath, the moisture in the blanket by the unperforated areas of the plastic sheet and by the release of fertilizer from the adjacent fiber mat as the moisture leaves the blanket and enters the soil.A second embodiment of the invention includes the continuation of the plastic sheet over the space between adjacent area of fiber blanket.
    Type: Grant
    Filed: February 19, 1976
    Date of Patent: December 21, 1976
    Assignee: Conwed Corporation
    Inventor: Frederick H. Riedel
  • Patent number: 3988410
    Abstract: Lubricants for the production of net-like products from nylon and polytetramethylene terephthalate are disclosed. The lubricants comprise polyolefin with a specific melt index, said polyolefins being homopolymers of olefins or copolymers of two or more olefins.
    Type: Grant
    Filed: March 21, 1975
    Date of Patent: October 26, 1976
    Assignee: Conwed Corporation
    Inventors: Ronald Leslie Larsen, William Bela Haffner
  • Patent number: 3977627
    Abstract: A device for winding and slitting rollable materials is disclosed. The device both winds and cuts the material simultaneously whereby evenly cut rolled material is obtained.
    Type: Grant
    Filed: June 25, 1973
    Date of Patent: August 31, 1976
    Assignee: Conwed Corporation
    Inventor: George Holger Sundin
  • Patent number: 3957554
    Abstract: A method for attaching plastic nets to non-woven blankets without use of adhesives is disclosed. The net is positioned adjacent the non-woven blanket and then the strands of the netting are vibrated causing surface fibers of the blanket to surround the strands and hold the net to the blanket without the use of adhesives.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: May 18, 1976
    Assignee: Conwed Corporation
    Inventor: George Holger Sundin
  • Patent number: 3939532
    Abstract: Fibrous web structures in which the individual fibers are uniformly felted in random orientation are produced by projecting a stream of solids suspended in air toward a moving porous collection surface. The fibers are maintained in a controlled condition uniformly dispersed in air during transit from the nozzle to the porous collecting surface and before the stream of air has spread to the point of disrupting the uniform fiber dispersion, the fibers are felted and collected on the porous support while air is continuously passed through the support to insure no gravity free fall of fibers. Liquid or dry adhesive binders may be incorporated into the structure at any convenient stage of the process but preferably before the web structure is formed on the moving support.
    Type: Grant
    Filed: October 19, 1973
    Date of Patent: February 24, 1976
    Assignee: Conwed Corporation
    Inventor: Donald E. Wiegand
  • Patent number: D246887
    Type: Grant
    Filed: July 16, 1976
    Date of Patent: January 10, 1978
    Assignee: Conwed Corporation
    Inventor: Austin Eckerline
  • Patent number: D246889
    Type: Grant
    Filed: July 16, 1976
    Date of Patent: January 10, 1978
    Assignee: Conwed Corporation
    Inventor: Austin Eckerline