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:
Feb. 27, 1979
Filed:
Dec. 27, 1976
James V Barnett, Cupertino, CA (US);
Donald R Duff, Mountain View, CA (US);
Larry D Wickwar, San Mateo, CA (US);
Fairchild Camera and Instrument Corporation, Mountain View, CA (US);
Abstract
A network of impedance elements comprising combinations of resistors and capacitors in which the impedance of the network is modified by the selective destruction of the individual elements of the network by electrical impulses. The selective destruction of the individual elements may be planned so as to result in any combination of shorting or opening thereof. In a specific application the frequency of the oscillator used in a digital watch is adjusted by the inclusion of a network of impedance elements, wherein the elements are then selectively destroyed in accordance with measurements of the oscillator frequency to improve the precision of oscillation. This selective destruction of elements may be done automatically by electrical means, resulting in less labor, greater speed and smaller size of the oscillator, all of which are extremely important in the manufacture of digital watches. The method also simplifies the production of digital watches.