Patents by Inventor Erhard Loewe

Erhard Loewe 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).

  • Lighttight cassette
    Patent number: 5126774
    Abstract: A lighttight cassette has a housing including a wall surrounding the periphery of a roll of web material supported therein. The housing also includes two ends, connected through the wall of the housing, on which the roll is supported in a rotatable manner. The cassette has an externally operated brake device that applies an adjustable friction locking between an end surface of the roll and the adjacent end wall, thereby preventing unwanted unwinding of the film during transportation and storage.
    Type: Grant
    Filed: March 1, 1991
    Date of Patent: June 30, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: E. W. Erhard Loewe, Otfried Urban
  • Cassette for holding a roll
    Patent number: 5046677
    Abstract: The present invention relates to a light-tight roll-film cassette for holding and dispensing rolls of light sensitive material, having brake means exerting a retarding force on the core of the roll. This brake means consist of a resilient tongue cooperating with the cylindric bearings.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: September 10, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Erhard Loewe, Ludger Bertels
  • Winding roller to wind and unwind photopolymer material
    Patent number: 5031854
    Abstract: A winding roller to wind and unwind photopolymeric material into a reel has two end disks which are slipped onto the two ends of a winding tube, respectively. Each end disk extends along a plane and has a substantially circular opening with an inner circumference of diameter d.sub.1 through which the end of the winding tube is slipped. Each end disk has at least three clamping cams having tips extending radially inward beyond the inner circumference, each clamping cam being defined by radial indentations adjacent the inner circle which allow the cam to be flexibly bent away from the plane of the end disk. The outer diameter of the winding tube has a value which lies between the inner diameter d.sub.1 of the end disk opening and the diameter d.sub.
    Type: Grant
    Filed: April 9, 1990
    Date of Patent: July 16, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Erhard Loewe
  • Roll cassette with spacers for height adjustment
    Patent number: 5009372
    Abstract: The present invention relates to a light-tight roll-film cassette for holding and dispensing light sensitive material, having means to adjust the vertical position of the cassette in the exposure device, these means consisting of attachable spacers.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: April 23, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Erhard Loewe
  • Lightproof cassette
    Patent number: 4889292
    Abstract: The present invention relates to a light-tight roll-film cassette for holding and dispensing light sensitive material, having lips forming a dispensing slot for the material drawn from the roll, these lips being mechanically enforced by ribs. The cassette has the advantage of improved light-tightness at the dispensing slot without increasing the dispensing forces.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: December 26, 1989
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Erhard Loewe, Ludger Bertels