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. 06, 1984
Filed:
Mar. 19, 1982
Gerd Schumacher, Pinneberg-Waldenau, DE;
Heinz-Werner Masurat, Pinneberg, DE;
B.A.T. Cigaretten-Fabriken GmbH, Hamburg, DE;
Abstract
In a process for determining the resistance to draw and the gas permeability of a test piece, for example a cigarette or a cigarette paper, a linearly increasing or decreasing volumetric flow is conveyed through the test piece. The volumetric flow and the pressure drop at the test piece are measured continuously and compared with predetermined reference values. When there is equality between at least one measured value and a reference value, the measured value pair under consideration, volumetric flow/pressure drop, is detected. It is thus possible, on the one hand, to determine the characteristic curve of the test piece, i.e. the change in the pressure drop with the volumetric flow, over a greater range of the volumetric flow, and, on the other hand, to measure pairs of values for accurately defined values of the volumetric flow and/or the pressure drop.