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).
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Publication number: 20240148955Abstract: Occlusion detection in a vacuum-based system for ophthalmic surgery includes a handpiece and aspiration and irrigation subsystems. The aspiration subsystem includes an aspiration line coupled to a handpiece, an aspiration pressure transducer, and a vacuum-based aspiration pump. The irrigation subsystem includes an irrigation line coupled to an irrigation source having an irrigation fluid, a handpiece, an irrigation pressure transducer, and a positive displacement pump. The system also includes a processor coupled to the positive displacement pump and a memory coupled to the processor. The memory includes executable instructions that cause the processor to determine a flow rate of irrigation fluid through the irrigation line, based on a rotation rate of the positive displacement pump, and provide an occlusion warning when the flow rate is below a threshold level and a vacuum is being commanded.Type: ApplicationFiled: October 9, 2023Publication date: May 9, 2024Inventors: James T. PERKINS, Logan C. KLUESNER, David W. HERTWECK
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Patent number: 11549481Abstract: 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: GrantFiled: March 3, 2022Date of Patent: January 10, 2023Inventor: David W. Perkins
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Patent number: 10273070Abstract: 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: GrantFiled: May 19, 2017Date of Patent: April 30, 2019Assignee: Paper Systems, Inc.Inventors: David W. Perkins, William L. Chase
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Publication number: 20180334305Abstract: 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: ApplicationFiled: May 19, 2017Publication date: November 22, 2018Inventors: David W. Perkins, William L. Chase
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Patent number: 9302806Abstract: 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: GrantFiled: December 11, 2013Date of Patent: April 5, 2016Assignee: Paper Systems, Inc.Inventor: David W. Perkins
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Publication number: 20150158625Abstract: 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: ApplicationFiled: December 11, 2013Publication date: June 11, 2015Applicant: PLASTIC SYSTEMS, INC.Inventor: David W. Perkins
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Publication number: 20150129649Abstract: 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: ApplicationFiled: November 8, 2013Publication date: May 14, 2015Applicant: PAPER SYSTEMS, INC.Inventor: David W. Perkins
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Patent number: 8016113Abstract: 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: GrantFiled: September 16, 2008Date of Patent: September 13, 2011Assignee: Plastic Systems, Inc.Inventor: David W. Perkins
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Patent number: 8016145Abstract: 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: GrantFiled: December 12, 2006Date of Patent: September 13, 2011Assignee: Plastic Systems, Inc.Inventor: David W. Perkins
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Patent number: 7819269Abstract: 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: GrantFiled: December 12, 2006Date of Patent: October 26, 2010Assignee: Plastic Systems, Inc.Inventor: David W. Perkins
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Publication number: 20100065466Abstract: 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: ApplicationFiled: September 16, 2008Publication date: March 18, 2010Inventor: David W. Perkins
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Patent number: 7628310Abstract: 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: GrantFiled: July 14, 2004Date of Patent: December 8, 2009Assignee: Paper Systems, Inc.Inventor: David W. Perkins
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Publication number: 20080135547Abstract: 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: ApplicationFiled: December 12, 2006Publication date: June 12, 2008Inventor: David W. Perkins
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Publication number: 20080137997Abstract: 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: ApplicationFiled: December 12, 2006Publication date: June 12, 2008Inventor: David W. Perkins
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Publication number: 20080135438Abstract: 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: ApplicationFiled: December 12, 2006Publication date: June 12, 2008Inventor: David W. Perkins
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Patent number: 6834792Abstract: 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: GrantFiled: October 16, 2002Date of Patent: December 28, 2004Assignee: Plastic Systems, Inc.Inventor: David W. Perkins
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Publication number: 20040251300Abstract: 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: ApplicationFiled: July 14, 2004Publication date: December 16, 2004Inventor: David W. Perkins
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Patent number: 6575629Abstract: 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: GrantFiled: August 21, 2001Date of Patent: June 10, 2003Assignee: Paper Systems, Inc.Inventor: David W. Perkins
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Patent number: 6516965Abstract: 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: GrantFiled: June 12, 2001Date of Patent: February 11, 2003Assignee: Paper Systems, Inc.Inventor: David W. Perkins
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Patent number: 6164453Abstract: 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: GrantFiled: September 16, 1999Date of Patent: December 26, 2000Assignee: Paper Systems, Inc.Inventor: David W. Perkins