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:
Sep. 26, 1989
Filed:
Feb. 24, 1987
Richard M Berger, Midlothian, VA (US);
American Filtrona Corporation, Richmond, VA (US);
Abstract
An ultra-high efficiency cigarette filter is formed from a web of entangled ultra-fine melt blown plastic fibers of extremely low bulk density, the fibers on average having a diameter in the range of 0.1 to 4 microns. The web is formed into a substantially cylindrical rod having a bulk density in the range of 0.029 to 0.046 gram per cc and is encapsulated in and supported by an external plastic tube which adheres to the outer surface of the rod over the entire area of contact therebetween. Cigarette filters in accordance with the invention may have filtration efficiencies in excess of 80%. The disclosure also includes processes and apparatus for manufacturing the high efficiency filters.