Patents by Inventor Norbert Freisitzer

Norbert Freisitzer 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: 5328546
    Abstract: A dry film photoresist laminator includes a punch and die assembly 24 which punches a rolled sheet dry film photoresist material 14, that is comprised of a dry film photoresist material 18 sandwiched between a Mylar top layer 16 and a polyolefin bottom layer 20, into photoresist decals. The photoresist decals are bonded to a tacky transport tape 40 which carries the decals to a polyolefin peeler assembly 54 that rolls a high tack tape 57 along the polyolefin layer 20 of the decal, thereby peeling it from the decal. The decal is advanced by a laminating assembly 44 which rolls the decal onto a heated wafer 72, thereby bonding the exposed photoresist material 18 to the wafer 72. Bonded wafer 72 and decal 14 are removed from the transport tape 40. A tape transport assembly 44 carrying the transport tape and decal is advanced through the various process steps.
    Type: Grant
    Filed: April 3, 1992
    Date of Patent: July 12, 1994
    Assignee: International Business Machines Corp.
    Inventors: William A. Brady, See A. Chan, Norbert Freisitzer, Rolf G. Meinert, Prakash Nahata, Julius J. Perlini, Mario G. M. Tavares, Douglas A. West
  • Patent number: 5106450
    Abstract: A dry film photoresist laminator includes a punch and die assembly 24 which punches a rolled sheet dry film photoresist material 14, that is comprised of a dry film photoresist material 18 sandwiched between a Mylar top layer 16 and a polyolefin bottom layer 20, into photresist decals. The photoresist decals are bonded to a tacky transport tape 40 which carries the decals to a polyolefin peeler assembly 54 that rolls a high tack tape 57 along the polyolefin layer 20 of the decal, thereby peeling it from the decal. The decal is advanced to a laminating assembly 71 which rolls the decal onto a heated wafer 72, thereby bonding the exposed photoresist material 18 to the wafer 72. The bonded wafer 72 and decal are advanced to a Mylar peeler assembly 82 which strips the transport tape 40 and the Mylar layer 16 away from the wafer 72, thereby leaving a wafer 72 which laminated with dry film photoresist material 18.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: April 21, 1992
    Assignee: International Business Machines Corporation
    Inventors: Norbert Freisitzer, Rolf G. Meinert