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. 22, 1977
Filed:
Apr. 19, 1976
Richard J Kostelnicek, Houston, TX (US);
Exxon Production Research Company, Houston, TX (US);
Abstract
A system is disclosed for removing a periodic interfering signal from an electrical signal which may also include a data signal such as a seismic signal. A digital representation of the interfering signal, comprising a series of digital words, is generated and a nulling signal formed from this digital signal is subtracted from said electrical signal. The amplitude difference between said electrical signal and the nulling signal is determined and the digital words comprising the digital representation of the interfering signal are changed by a function of the difference between said electrical signal and said nulling signal, to reduce said difference.