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:
Jun. 30, 1987
Filed:
Jul. 03, 1986
Hans K Schuster, Bruckmuhl, DE;
Jens-Peter Heins, Feldkirchen-Westerham, DE;
Bernhard Gockel, Germering, DE;
Holger Schmidt, Munich, DE;
Gessner & Co. GmbH, Mangfall, DE;
Abstract
The porosity of a strip of material is continuously computed by causing air to be drawn through the material as the strip moves across a perforated head situated atop a chamber in which the pressure is reduced by suction. In one embodiment, the reduced pressure is held substantially constant while the amount of air drawn through the chamber is measured and the porosity is determined by a computer whose inputs include the measured volume of air flow through the chamber and the speed at which the strip moves across the head, in addition to other inputs. In another embodiment, the volume of air flowing through the chamber is held substantially constant while the pressure in the chamber is measured and used as an input to the computer. In both embodiments, the speed at which the strip moves across the head is employed as a factor in the porosity computation.