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:
May. 03, 1977
Filed:
Nov. 14, 1975
Robert A Broding, Tulsa, OK (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
An apparatus and method for generating seismic signals are described using a modulated vacuum within a chamber plus a compliant, vibration-isolating means. This compliant, vibration-isolating means provides a seal between the chamber and the earth, and also generally prevents the vibration of the chamber from being transferred to the earth. The seismic signal is transmitted directly to the earth by the changes in absolute air pressure within the chamber (the modulated vacuum). As the vibrations of the chamber are generally out of phase with the force developed by the changes in chamber pressure, the chamber vibrations must, for good efficiency, be isolated from the earth. This arrangement is lightweight and inexpensive, as there is no need for either a special mass to induce the vibrations or a special mass to hold the vibrating mass in contact with the earth's surface.