The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2005
Filed:
Nov. 01, 2001
Randy S. Bay, Woodbury, MN (US);
Cristina U. Thomas, Woodbury, MN (US);
David F. Slama, Vadnais Heights, MN (US);
Richard T. Paxton, Ames, IA (US);
Gary L. Curtis, River Falls, WI (US);
Jonathan J. Mattson, Stillwater, MN (US);
Randy S. Bay, Woodbury, MN (US);
Cristina U. Thomas, Woodbury, MN (US);
David F. Slama, Vadnais Heights, MN (US);
Richard T. Paxton, Ames, IA (US);
Gary L. Curtis, River Falls, WI (US);
Jonathan J. Mattson, Stillwater, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A method for capping a stem web including passing the stem web through a first nip against a first heated nip roll so as to partially cap the stems; cooling the web; and passing the stem web through a second nip against a second heated nip roll to completely cap the stems to a diameter 'D'. In preferred embodiments the two nips are on opposite sides of a larger central cooled roll positioned between the heated rolls. Preferably, the reaction forces between the rolls are measured and controlled at each end of each other heated rolls. The invention is particularly adapted to making abrasive particles that are attached to a driving mechanism via headed stem fasteners formed by the method.