Patents by Inventor Mark J. Stevenson

Mark J. Stevenson 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 improving coating uniformity
    Patent number: 7615175
    Abstract: The invention is a method of forming extrudate having substantially uniform thickness. A shim is formed which has a thickness variation of less than or equal to about 0.5 mil (13 microns) total indicated runout. This shim is disposed between a first die portion having a first surface and a second die portion having a second surface. A slot is formed between the first surface and the second surface. The slot has a height dimension substantially the same as the shim thickness. Flowable material is extruded through the slot.
    Type: Grant
    Filed: August 3, 2004
    Date of Patent: November 10, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: James M. Nelson, Raghunath Padiyath, Robert B. Secor, Mark J. Stevenson, Michael J. Tichy, Robert A. Yapel
  • Method of improving coating uniformity
    Patent number: 6813820
    Abstract: The invention is a method of forming extrudate having substantially uniform thickness. A shim is formed which has a thickness variation of less than or equal to about 0.5 mil (13 microns) total indicated runout. This shim is disposed between a first die portion having a first surface and a second die portion having a second surface. A slot is formed between the first surface and the second surface. The slot has a height dimension substantially the same as the shim thickness. Flowable material is extruded through the slot.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: November 9, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: James M. Nelson, Raghunath Padiyath, Robert B. Secor, Mark J. Stevenson, Michael J. Tichy, Robert A. Yapel
  • Method of improving coating uniformity
    Publication number: 20030116881
    Abstract: The invention is a method of forming extrudate having substantially uniform thickness. A shim is formed which has a thickness variation of less than or equal to about 0.5 mil (13 microns) total indicated runout. This shim is disposed between a first die portion having a first surface and a second die portion having a second surface. A slot is formed between the first surface and the second surface. The slot has a height dimension substantially the same as the shim thickness. Flowable material is extruded through the slot.
    Type: Application
    Filed: December 19, 2001
    Publication date: June 26, 2003
    Inventors: James M. Nelson, Raghunath Padiyath, Robert B. Secor, Mark J. Stevenson, Michael J. Tichy, Robert A. Yapel