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:
Jan. 16, 1979
Filed:
Jan. 18, 1978
Gunter Kruger, Leonberg, DE;
Klaus Kuttner, Stuttgart, DE;
Manfred Widmaier, Leonberg, DE;
Erich Leinauer, Besigheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A thin film path of medium resistivity provided by a strip of tantalum by which a design parameter of an electronic component is determined is modified by making contact with the path by an electrode having an electrolyte at its tip in passing an anodizing current into the path through the electrode that is much smaller in value than the normal current flowing through the path under design conditions of operation. In consequence, the current injected to produce chemical change in the resistance has a negligible effect on the characteristics of operation of the component and the component can have operating conditions applied to it during the trimming process can be carried while the component is under operating conditions and the parameter to be adjusted is being measured, so that the measurements of the parameter can control the current injected through the electrode so as to shut it off when the desired value of the measured parameter is reached. When the difference between actual and desired values reaches a certain small value, it is advantageous to switch over the current source for the electrode to a lower value of current in order to make possible a closer approach to the design value.