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. 22, 1977
Filed:
Jan. 27, 1975
Warren A Brackmann, Cooksville, CA;
Daniel Di Ianni, Toronto, CA;
Rothmans of Pall Mall Canada Limited, Toronto, CA;
Abstract
A tobacco smoke filter comprising a single filter element consisting wholly of a plurality of randomly-oriented non-crimped smooth-surfaced solid fibers of thermoplastic polymeric non-absorbent material, each of the fibers having a uniform diameter less than about 5 microns. The filter element has a generally circular cross-section taken across the intended flow path of the tobacco smoke and a diameter substantially equal to the diameter of a tobacco smoke flow path. The weight of polymeric material exceeds about 6 mg and the filter element has a pressure drop thereacross of from 1 to 10 inches of water at a flow rate of 17.5 ml/sec.