Patents by Inventor Charles Propst

Charles Propst 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).

  • Method of recycling plastic coated containers
    Patent number: 5531863
    Abstract: Recyclable containers such as corrugated or folding boxes are made from a coated paper or kraft grade sheet including a plastic coating thereon. Aqueous acrylic resin containing compositions can be applied in excess on the paper or kraft grade sheet and the unwanted coating metered and removed by directing a jet of air at the coating. After solidification of the coating, the coated paper or kraft sheets can be incorporated as components of corrugated or folding boxes. Recovery of the unwanted coating permits recycling of the coating component. Corrugated and folding boxes including the components can be recycled by conventional repulping processes. A process of manufacture of the coated sheets is also disclosed.
    Type: Grant
    Filed: February 9, 1995
    Date of Patent: July 2, 1996
    Assignee: Timbarco, Corp. c/o Belfint, Lyons & Schuman
    Inventor: Charles Propst
  • Recyclable plastic coated containers
    Patent number: 5429294
    Abstract: Recyclable containers such as corrugated or folding boxes are made from a coated paper or kraft grade sheet including a plastic coating thereon. Aqueous acrylic resin containing compositions can be applied in excess on the paper or kraft grade sheet and the unwanted coating metered and removed by directing a jet of air at the coating. After solidification of the coating, the coated paper or kraft sheets can be incorporated as components of corrugated or folding boxes. Recovery of the unwanted coating permits recycling of the coating component. Corrugated and folding boxes including the components can be recycled by conventional repulping processes. A process of manufacture of the coated sheets is also disclosed.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: July 4, 1995
    Assignee: Timbarco Corp.
    Inventor: Charles Propst
  • Recyclable plastic coated containers
    Patent number: 5393566
    Abstract: Recyclable containers such as corrugated or folding boxes are made from a coated paper or kraft grade sheet including a plastic coating thereon. Aqueous acrylic resin containing compositions can be applied in excess on the paper or kraft grade sheet and the unwanted coating metered and removed by directing a jet of air at the coating. After solidification of the coating, the coated paper or kraft sheets can be incorporated as components of corrugated or folding boxes. Recovery of the unwanted coating permits recycling of the coating component. Corrugated and folding boxes including the components can be recycled by conventional repulping processes. A process of manufacture of the coated sheets is also disclosed.
    Type: Grant
    Filed: October 27, 1992
    Date of Patent: February 28, 1995
    Assignee: Tim-Bar Coproration
    Inventor: Charles Propst