Patents by Inventor John W. Papsdorf

John W. Papsdorf 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: 4163474
    Abstract: Fluid-carrying tubes for a heat exchanger are provided with internal longitudinal fins formed separately from the tube itself. One form utilizes individual elongated V-shaped strips biased radially outwardly by an annular sheet metal spring, with the tips of the fins brazed to the inner surface of the tube wall. Second and third embodiments utilize a one-piece corrugated sheet metal cylinder rather than individual strips, but with adjacent fins being almost completely severed from each other to provide sharp edge contact between the tips of the fins and the tube wall for optimum brazing. Either the fins or tube inner wall is clad with a lower-melting point material which permits furnace brazing of the fin tips to the tube wall. All three forms have longitudinally spaced holes and slots to enhance heat exchange by inducing transverse fluid flow through the fins and to allow liquid levels to equalize.
    Type: Grant
    Filed: June 9, 1977
    Date of Patent: August 7, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert D. MacDonald, Robert K. Rose, John W. Papsdorf
  • Patent number: 3957188
    Abstract: In an apparatus for performing various operations on stock material, such as advancing, feeding, measuring, cutting and the like, all under the control of a program on a punched tape, an improved punched tape control system wherein the sprocket holes, which are utilized for advancing the punched tape, are also utilized to convey control information. Data is placed on the tape in the form of perforations on parallel longitudinal tracks or channels and the conventional tape advancing sprocket holes also carry data to both control the advancing of the stock material and to synchronize the advancing of the stock material and the advancing of the punched tape. Stock material is advanced only when a sprocket hole is present in the tape and the tape is advanced only when the stock material is operated on in accordance with the data on the tape.
    Type: Grant
    Filed: July 23, 1975
    Date of Patent: May 18, 1976
    Assignee: Cardinal of Adrian, Inc.
    Inventor: John W. Papsdorf
  • Patent number: 3957189
    Abstract: In an apparatus for performing various operations on stock material, such as advancing, feeding, measuring, cutting and the like, all under the control of a program on a punched tape, an improved punched tape control system wherein the sprocket holes, which are utilized for advancing the punched tape, are also utilized to convey control information. Data is placed on the tape in the form of perforations on parallel longitudinal tracks or channels and the conventional tape advancing sprocket holes also carry data to both control the advancing of the stock material and to synchronize the advancing of the stock material and the advancing of the punched tape. Stock material is advanced only when a sprocket hole is present in the tape and the tape is advanced only when the stock material is operated on in accordance with the data on the tape.
    Type: Grant
    Filed: July 23, 1975
    Date of Patent: May 18, 1976
    Assignee: Cardinal of Adrian, Inc.
    Inventor: John W. Papsdorf
  • Patent number: 3955736
    Abstract: In an apparatus for performing various operations on stock material, such as advancing, feeding, measuring, cutting and the like, all under the control of a program on a punched tape, an improved punched tape control system wherein the sprocket holes, which are utilized for advancing the punched tape, are also utilized to convey control information. Data is placed on the tape in the form of perforations on parallel longitudinal tracks or channels and the conventional tape advancing sprocket holes also carry data to both control the advancing of the stock material and to synchronize the advancing of the stock material and the advancing of the punched tape. Stock material is advanced only when a sprocket hole is present in the tape and the tape is advanced only when the stock material is operated on in accordance with the data on the tape.
    Type: Grant
    Filed: July 23, 1975
    Date of Patent: May 11, 1976
    Assignee: Cardinal of Adrian, Inc.
    Inventor: John W. Papsdorf