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. 24, 1992
Filed:
Feb. 15, 1991
Applicant:
Inventor:
Ake A Hellstrom, Columbus, OH (US);
Assignee:
ABB Process Automation Inc., Columbus, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B / ; G01B / ; G01N / ;
U.S. Cl.
CPC ...
2503581 ; 250308 ; 2503591 ; 73159 ;
Abstract
A device for measuring the gap between the radiation source and the radiation sensor of a basis weight gauge. A caliper sensor measures the thickness of a sheet of material as it passes through the gap, while the caliper contact shoe rides on the sheet and urges it against a first side of the gap. A linear variable differential transformer measures the distance between a reference point on the contact shoe and the opposed side of the gap. The gap dimension is the sum of the sheet thickness, the distance between the caliper reference point and the second side of the gap, and a readily measurable constant.