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. 04, 1980
Filed:
Jun. 26, 1978
Richard R Baker, Dibden Purlieu, GB;
Barry G Bunn, Shirley, GB;
British-American Tobacco Company Limited, London, GB;
Abstract
An instrument for measuring the air permeability of cigarette paper, including a paper-clamping head arranged to expose a fixed area of paper to a flow of pressurized air from an air pump. A manometer is arranged to measure the pressure differential across the paper and the gas flow is controllable by a control valve to enable a predetermined pressure differential to be maintained. The flow rate through the paper is measured by one of three flowmeters arranged in three parallel gas supply passages for measuring the flow rate in a low medium and high flow rate range respectively. The paper clamping head is such that the flow impedance downstream of the tapping point of the pressure transducer is negligible.