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:
Nov. 20, 1979
Filed:
Jun. 29, 1977
Richard H Martin, Pisgah Forest, NC (US);
William F Owens, Jr, Pisgah Forest, NC (US);
Olin Corporation, Pisgah Forest, NC (US);
Abstract
An improved ventilated filter tip cigarette is provided utilizing a unique combination of porous filter plug wrap having a porosity of from about 300 to 4000 Filtrona air permeability units with a microperforated tipping envelope having perforations averaging less than about 0.01 mm.sup.2 each in open area. The relationship of plug wrap porosity combined with the size of microperforations in the tipping envelope provide cigarettes with maximum selective reductions in carbon monoxide yields and only minor reductions in nicotine yields as compared to constituent yields heretofore obtained in the smoke from ventilated cigarettes.