申请人 |
E.I. DU PONT DE NEMOURS & CO., WILMINGTON, DEL., US |
发明人 |
BERGMANN, OSWALD, ROBERT, WILMINGTON, DE 19803, US;FELIX, VINCI, MARTINEZ, KENNETT SQUARE, PA 19348, US;SIMMONS, WALTER, JOHN, MARTINSBURG, WV 25401, US;TIETJEN, RICHARD, HOWARD, JEANNETTE, PA 15644, US |