Patents by Inventor Sigurd Guenter Hagen

Sigurd Guenter Hagen 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: 5856065
    Abstract: Negative working photoresist compositions containing:a) a polyimide primer containing recurring structural units of formula (I) in the specification as well asb) a photoinitiator for polymerizing olefin double bonds, which are characterized by in that they containat least one other component c), which is selected from the group consisting ofc1) organosilicon compounds with one or more hydroxyl groups,c2) compounds of formula (IIa) in the specification,c3) compounds of formula (IIb) as in the specification,c4) mixtures comprised of two or more components selected from components of c1), c2) and c3),have the advantage that they can be developed with a developer, which comprises up to 50 to 100 wt. % of an aqueous-alkaline medium, whereby the balance to 100 wt. % is formed by one or more organic solvents.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: January 5, 1999
    Assignee: Olin Microelectronic Chemicals, Inc.
    Inventor: Sigurd Guenter Hagen