Patents by Inventor David D. Ngo

David D. Ngo 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).

  • Environmentally friendly removal of photoresists used in wet etchable polyimide processes
    Patent number: 6159666
    Abstract: Normally, a positive photoresist is developed with an alkaline aqueous solution to form patterns, and is subsequently stripped with an organic solvent after the photoresist has served its function. Such strippers are relatively toxic and damaging to the environment, and cannot be handled by standard (community) waste-water treatment facilities. These strippers cannot be easily neutralized, and must be disposed of in a highly specialized and relatively expensive manner. The present invention provides a method of treating positive and negative photoresists during their usage as photo masks such that the photoresists may be removed by less toxic chemicals which can be readily neutralized and handled by conventional waste water treatment facilities.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: December 12, 2000
    Assignee: Fijitsu Limited
    Inventors: David D. Ngo, Som S. Swamy
  • Photoimageable polyimide coating
    Patent number: 5599655
    Abstract: A photoimageable polyimide coating which can be prepared from the polymeric condensation product of 6FDA, DMDE or MEDA, and a photosensitizing moiety. More particularly, the present invention relates to a photoimageable polyimide coating useful for microelectronic applications.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: February 4, 1997
    Assignee: Amoco Corporation
    Inventor: David D. Ngo
  • Photoimageable polyimide coating
    Patent number: 5532110
    Abstract: A photoimageable polyimide coating which can be prepared from the polymeric condensation product of 6FDA, DMDE or MEDA, and a photosensitizing moiety. More particularly, the present invention relates to a photoimageable polyimide coating useful for microelectronic applications.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: July 2, 1996
    Assignee: Amoco Corporation
    Inventor: David D. Ngo
  • Photocurable polyimide coated glass fiber
    Patent number: 5504830
    Abstract: An optical glass fiber coated with a protective layer of photocurable polyimide coating which can be prepared from the polymeric condensation product of 6FDA, DMDE, and a photosensitizing moiety. More particularly, the present invention relates to a photocurable polyimide coated glass fiber useful for optic applications.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: April 2, 1996
    Assignee: Amoco Corporation
    Inventors: David D. Ngo, Paul J. Cahill, John J. Greczek
  • Photoimageable polyimide coating
    Patent number: 5501941
    Abstract: A photoimageable polyimide coating which can be prepared from the polymeric condensation product of 6FDA, DMDE or MEDA, and a photosensitizing moiety. More particularly, the present invention relates to a photoimageable polyimide coating useful for microelectronic applications.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: March 26, 1996
    Assignee: Amoco Corporation
    Inventor: David D. Ngo
  • Photocurable polyimide coated glass fiber
    Patent number: 5427862
    Abstract: An optical glass fiber coated with a protective layer of photocurable polyimide coating which can be prepared from the polymeric condensation product of 6FDA, DMDE, and a photosensitizing moiety. More particularly, the present invention relates to a photocurable polyimide coated glass fiber useful for optic applications.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: June 27, 1995
    Assignee: Amoco Corporation
    Inventors: David D. Ngo, Paul J. Cahill, John J. Greczek