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. 30, 1999
Filed:
Jul. 14, 1997
Robert F Van Der Ven, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A quantity of material is locally deposited on or removed from a substantially flat substrate of a circuit board. The quantity is inspected by carrying out a first measurement of a level of a surface of the material in a direction transversely of the substrate. At least two further measurements are performed of a further level of the substrate in said direction in at least two further locations where the material has not been deposited or removed. A reference level of the substrate is calculated by interpolation between the further measurements to a location of the first measurement. The quantity of material is inspected on the basis of a difference between the first measurement and the reference level.