Patents by Inventor David W. Perkins

David W. Perkins 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: 11549481
    Abstract: A system for converting fluid flow into electricity. The system has an arm assembly with four floats that rotate around a center float. The floats on the arm assembly are all provided with impellers that turn one half revolution for every one revolution of the arm assembly. This slow rotation maintains the impellers at the optimal angle to convert the flow of the water current into rotational motion of the arm assembly, regardless of the orientation of the arm assembly. The arm assembly is coupled to an electric generator provided on the center float that converts torque generated by the arm assembly into electric power that may either be stored on an on-board battery or transmitted by wire for use elsewhere.
    Type: Grant
    Filed: March 3, 2022
    Date of Patent: January 10, 2023
    Inventor: David W. Perkins
  • Patent number: 10273070
    Abstract: A collapsible container for the storage and transport of flowable material. The container is provided with a continuous sheet of side panels secured into stepped engagement with itself to define an interior. Foldable support brackets are secured to the side panels to maintain the side panels at an angled orientation relative to the side panels of the container and to prevent distortion of the side panels by hydrostatic pressure toward a circular orientation. The support brackets define an opening in the top of the collapsible container through which a fill head may engage a top cap of a flexible liner provided within the collapsible container, to fill the liner with flowable material.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: April 30, 2019
    Assignee: Paper Systems, Inc.
    Inventors: David W. Perkins, William L. Chase
  • Publication number: 20180334305
    Abstract: A collapsible container for the storage and transport of flowable material. The container is provided with a continuous sheet of side panels secured into stepped engagement with itself to define an interior. Foldable support brackets are secured to the side panels to maintain the side panels at an angled orientation relative to the side panels of the container and to prevent distortion of the side panels by hydrostatic pressure toward a circular orientation. The support brackets define an opening in the top of the collapsible container through which a fill head may engage a top cap of a flexible liner provided within the collapsible container, to fill the liner with flowable material.
    Type: Application
    Filed: May 19, 2017
    Publication date: November 22, 2018
    Inventors: David W. Perkins, William L. Chase
  • Patent number: 9302806
    Abstract: A collapsible container having thick corrugated walls with double crease corners. The double crease corners define two 45° angles instead of one 90° to allow the container to maintain a generally rectangular shape and reduce the tendency of the side panels to bias outward when the container is filled with a flowable material.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: April 5, 2016
    Assignee: Paper Systems, Inc.
    Inventor: David W. Perkins
  • Publication number: 20150158625
    Abstract: A collapsible container having thick corrugated walls with double crease corners. The double crease corners define two 45° angles instead of one 90° to allow the container to maintain a generally rectangular shape and reduce the tendency of the side panels to bias outward when the container is filled with a flowable material.
    Type: Application
    Filed: December 11, 2013
    Publication date: June 11, 2015
    Applicant: PLASTIC SYSTEMS, INC.
    Inventor: David W. Perkins
  • Publication number: 20150129649
    Abstract: An interlocking container for the storage and transport of flowable material. The container is provided with a plurality of interlocking top panels. The panels are provided with catches that alternately engage the top and bottom of adjacent panels to prevent the panels from becoming dislodged from one another and to maintain the side panels at an angled orientation relative to the side panels of the container, to prevent distortion of the side panels by hydrostatic pressure toward a circular orientation. The panels define an opening in the top of the collapsible through which a fill head may engage a top cap of a flexible liner provided within the collapsible container, to fill the liner with flowable material.
    Type: Application
    Filed: November 8, 2013
    Publication date: May 14, 2015
    Applicant: PAPER SYSTEMS, INC.
    Inventor: David W. Perkins
  • Patent number: 8016145
    Abstract: A stackable collapsible container for flowable materials. The container has a flexible outer skin and rigid support, having a top frame and bottom frame connected by poles. The top frame and bottom frame are designed for mating engagement when the containers are stacked, as well as for mating engagement when the containers are broken down for transport. The top frame and bottom frame are provided with similar perimeters to prevent undesired movement and contact between adjacent top frame when the containers are filled and transported.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: September 13, 2011
    Assignee: Plastic Systems, Inc.
    Inventor: David W. Perkins
  • Patent number: 8016113
    Abstract: A stackable, collapsible container for flowable materials. The container utilizes an outer container and a flexible inner liner retained by a base, a top and a plurality of support poles. The support poles are retained in a plurality of holes in the base provided with a plurality of wedges to secure the holes against lateral movement. Providing wedges within tapered holes facilitates the compression molding of the depth of holes required for adequately supporting the support poles.
    Type: Grant
    Filed: September 16, 2008
    Date of Patent: September 13, 2011
    Assignee: Plastic Systems, Inc.
    Inventor: David W. Perkins
  • Patent number: 7819269
    Abstract: A stackable collapsible container for flowable materials. The container has a flexible outer skin and rigid support, having a top frame and bottom frame connected by poles. The top frame and bottom frame are designed for mating engagement when the containers are stacked, as well as for mating engagement when the containers are broken down for transport. The top frame and bottom frame are provided with similar perimeters to prevent undesired movement and contact between adjacent top frame when the containers are filled and transported.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: October 26, 2010
    Assignee: Plastic Systems, Inc.
    Inventor: David W. Perkins
  • Publication number: 20100065466
    Abstract: A stackable, collapsible container for flowable materials. The container utilizes an outer container and a flexible inner liner retained by a base, a top and a plurality of support poles. The support poles are retained in a plurality of holes in the base provided with a plurality of wedges to secure the holes against lateral movement. Providing wedges within tapered holes facilitates the compression molding of the depth of holes required for adequately supporting the support poles.
    Type: Application
    Filed: September 16, 2008
    Publication date: March 18, 2010
    Inventor: David W. Perkins
  • Patent number: 7628310
    Abstract: A lightweight, collapsible container is provided for storing and transporting flowable materials on an irregularly shaped rectangular pallet. The container is provided with interlocking panels across the bottom, which are maintained in position by hydrostatic pressure generated by flowable material positioned within a flexible bag provided within the container. The top of the container is allowed to orient into its hydrostatically biased equilateral orientation, and provided with an equilateral octangular lid. This construction maintains the container bottom width substantially less than its length, with a minimum of support structures and materials.
    Type: Grant
    Filed: July 14, 2004
    Date of Patent: December 8, 2009
    Assignee: Paper Systems, Inc.
    Inventor: David W. Perkins
  • Publication number: 20080135547
    Abstract: A stackable collapsible container for flowable materials. The container has a flexible outer skin and rigid support, having a top frame and bottom frame connected by poles. The top frame and bottom frame are designed for mating engagement when the containers are stacked, as well as for mating engagement when the containers are broken down for transport. The top frame and bottom frame are provided with similar perimeters to prevent undesired movement and contact between adjacent top frame when the containers are filled and transported.
    Type: Application
    Filed: December 12, 2006
    Publication date: June 12, 2008
    Inventor: David W. Perkins
  • Publication number: 20080135438
    Abstract: A stackable collapsible container for flowable materials. The container has a flexible outer skin and rigid support, having a top frame and bottom frame connected by poles. The top frame and bottom frame are designed for mating engagement when the containers are stacked, as well as for mating engagement when the containers are broken down for transport. The top frame and bottom frame are provided with similar perimeters to prevent undesired movement and contact between adjacent top frame when the containers are filled and transported.
    Type: Application
    Filed: December 12, 2006
    Publication date: June 12, 2008
    Inventor: David W. Perkins
  • Publication number: 20080137997
    Abstract: A stackable collapsible container for flowable materials. The container has a flexible outer skin and rigid support, having a top frame and bottom frame connected by poles. The top frame and bottom frame are designed for mating engagement when the containers are stacked, as well as for mating engagement when the containers are broken down for transport. The top frame and bottom frame are provided with similar perimeters to prevent undesired movement and contact between adjacent top frame when the containers are filled and transported.
    Type: Application
    Filed: December 12, 2006
    Publication date: June 12, 2008
    Inventor: David W. Perkins
  • Patent number: 6834792
    Abstract: A lightweight, collapsible container is provided for storing and transporting flowable materials on an irregularly shaped rectangular pallet. The container is provided with interlocking panels across the bottom, which are maintained in position by hydrostatic pressure generated by flowable material positioned within a flexible bag provided within the container. The top of the container is allowed to orient into its hydrostatically biased equilateral orientation, and provided with an equilateral octangular lid. This construction maintains the container bottom width substantially less than it length, with a minimum of support structures and materials.
    Type: Grant
    Filed: October 16, 2002
    Date of Patent: December 28, 2004
    Assignee: Plastic Systems, Inc.
    Inventor: David W. Perkins
  • Publication number: 20040251300
    Abstract: A lightweight, collapsible container is provided for storing and transporting flowable materials on an irregularly shaped rectangular pallet. The container is provided with interlocking panels across the bottom, which are maintained in position by hydrostatic pressure generated by flowable material positioned within a flexible bag provided within the container. The top of the container is allowed to orient into its hydrostatically biased equilateral orientation, and provided with an equilateral octangular lid. This construction maintains the container bottom width substantially less than its length, with a minimum of support structures and materials.
    Type: Application
    Filed: July 14, 2004
    Publication date: December 16, 2004
    Inventor: David W. Perkins
  • Patent number: 6575629
    Abstract: A collapsible bag comprising a flexible outer skin, defining an interior and a substantially unobstructed opening. Reinforcing material is provided around said opening to define a pocket containing a rigid support, which allows the bag to hydrostabilize when filled with a fluid.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: June 10, 2003
    Assignee: Paper Systems, Inc.
    Inventor: David W. Perkins
  • Patent number: 6516965
    Abstract: A stackable collapsible container for flowable materials is provided, having a flexible outer skin and a rigid support having a top, a bottom and a middle. Means are provided for coupling the top of the rigid support to the flexible outer skin and for securing the bottom of the rigid support against substantial movement relative to the flexible outer skin.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: February 11, 2003
    Assignee: Paper Systems, Inc.
    Inventor: David W. Perkins
  • Patent number: 6164453
    Abstract: A bulk container for flowable materials includes flexible inner and outer tubular members. The lower edge of the outer member and the lower edge of the inner member are joined together along a bottom peripheral seam. Vertical support members are inserted into a plurality of pockets around the container so that the container is automatically self-stabilizing.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: December 26, 2000
    Assignee: Paper Systems, Inc.
    Inventor: David W. Perkins
  • Patent number: 6000549
    Abstract: A container includes a flexible liner for holding fluent material, a plurality of substantially vertical rigid support walls spaced around the periphery of the liner, and a flexible skin interconnecting the walls and encircling the liner so as to laterally constrain and support the liner when fluent material is added. The container can include a bottom wall under the liner and connected to some of the support walls. Furthermore, a top platform can be removably secured over the liner so as to rest on top of the support walls. This provides the strength and rigidity to make the container system stackable. The support walls can be removably disposed in pockets or a sleeve in the flexible skin.
    Type: Grant
    Filed: August 11, 1998
    Date of Patent: December 14, 1999
    Assignee: Paper Systems, Inc.
    Inventor: David W. Perkins