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:
May. 27, 1997
Filed:
Jun. 21, 1994
Richard M Berger, Midlothian, VA (US);
Robert G Hemsworth, Glen Allen, VA (US);
American Filtrona Corporation, Richmond, VA (US);
Abstract
A method for forming successive spaced crimps in a tow of fibrous material by passing the tow along a path defined by an apparatus comprising a plurality of crimping wheels disposed around the path, each wheel including teeth having crimping surfaces and adjacent sealing surfaces which slide over one another during crimping to prevent material from being squeezed between the teeth thereby forming crimped sections with elongate edges which are substantially free of flashing connecting non-crimped sections. A second crimping step may be incorporated to form longitudinal grooves in alternate non-crimped sections. The rod-like member produced by these techniques may be overwrapped to provide pockets surrounding the crimped sections which may be filled with a smoke-modifying material, for example, activated charcoal particles. Discrete elements cut from the rod-like member may be used in cigarettes and the like such as in the production of filtered cigarettes.