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:
Mar. 27, 1990
Filed:
Mar. 03, 1986
Applicant:
Inventors:
Martin G Duke, Southampton, GB;
Peter R White, Romsey, GB;
Assignee:
British-American Tobacco Company Limited, London, GB;
Primary Examiner:
Int. Cl.
CPC ...
A24C / ; A24D / ;
U.S. Cl.
CPC ...
493 42 ; 493 43 ; 131336 ;
Abstract
A method of making a ventilated cigarette filter plug in which a bore is thermally formed, by a laser beam for example, in a rod comprising a duct extending coaxially of the rod and matrix material surrounding the duct. The thermally formed bore extends through the matrix material to provide air-flow communication between the periphery of the rod and the interior of the duct.