Patents by Inventor Noel L. Douglas

Noel L. Douglas 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).

  • Abrasion process for the manufacture of microporous film
    Patent number: 4832886
    Abstract: A vapor permeable and liquid impermeable microporous film suitable for diaper back sheets and other disposable applications is produced by abrading a filled, unoriented film by passing it through at least one set of at least two cooperating nip rollers, each having an abrasive grit surface.
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: May 23, 1989
    Assignee: El Paso Products Company
    Inventor: Noel L. Douglas
  • Process for the manufacture of microporous film
    Patent number: 4815714
    Abstract: A vapor permeable and liquid impermeable microporous film suitable for diaper back sheets and other disposable applications is produced by first abrading a filled, unoriented film by passing it through at least one set of at least two cooperating nip rollers, each having an abrasive grit surface and then subjecting the unoriented abraded film to a corona treatment.
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: March 28, 1989
    Assignee: El Paso Products Company
    Inventor: Noel L. Douglas
  • Process for the manufacture of porous film
    Patent number: 4778634
    Abstract: A vapor and liquid permeable porous film suitable for disposable sanitary apparel structures is produced by first abrading an unoriented film by passing it through at least one set of at least two cooperating nip rollers, each having an abrasive grit surface and then subjecting the unoriented abraded film to a corona treatment.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: October 18, 1988
    Assignee: El Paso Products Company
    Inventor: Noel L. Douglas