Patents by Inventor Clancy P. Crooks

Clancy P. Crooks 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 application of a conforming mask to a printed circuit board
    Patent number: 5164284
    Abstract: A dry film for forming a solder mask includes a cover sheet, a photoimageable composition layer which is curable to form a solder mask and a top coat interposed between the cover sheet and the photoimageable composition layer which is selectively adherent to the photoimageable composition layer. The dry film is applied to a surface of a printed circuit board. With heat, vacuum and mechanical pressure, the photoimageable composition layer is laminated to the irregular surface of the printed circuit board, partially conforming the photoimageable composition layer to the contours thereof. Within about 60 seconds and with the photoimageable composition layer still heated, the cover sheet is peeled away, leaving the top coat as a protective covering over the photoimageable composition layer. Removal of the cover sheet allows the photoimageable composition layer to fully conform to the contours of the printed circuit board. Immediately thereafter, the circuit board is cooled to about ambient temperature or below.
    Type: Grant
    Filed: November 19, 1991
    Date of Patent: November 17, 1992
    Assignee: Morton International, Inc.
    Inventors: James J. Briguglio, Leo Roos, Clancy P. Crooks, Samuel W. Shoemaker
  • Dry film photoresist for forming a conformable mask and method of application to a printed circuit board or the like
    Patent number: 4992354
    Abstract: A dry film for forming a solder mask includes a cover sheet, a photoimageable composition layer which is curable to form a solder mask and a top coat interposed between the cover sheet and the photoimageable composition layer which is selectively adherent to the photoimageable composition layer. The dry film is applied to a surface of a printed circuit board with a minor portion of the area of the photoimageable composition layer tacked to the printed circuit board. The cover sheet is peeled away. With heat and vacuum, the photoimageable composition layer is laminated to the irregular surface of the printed circuit board, conforming the photoimageable composition layer to the contours thereof and leaving the top coat as a protective covering over the photoimageable composition layer. The photoimageable composition layer is exposed to patterned actinic radiation, developed and cured to form a hard, permanent solder mask.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: February 12, 1991
    Assignee: Morton International, Inc.
    Inventors: Frederick J. Axon, James J. Briguglio, Amedeo Candore, Lawson Lightfoot, Clancy P. Crooks, Leo Roos