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:
Dec. 23, 1997
Filed:
Apr. 30, 1996
Demmie L Mosley, Pampa, TX (US);
Titan Specialties, Inc., Pampa, TX (US);
Abstract
A select fire gun assembly for jet perforating includes a plurality of shaped charges capable of being detonated by blasting caps activated by passage of current through the cap. The first electric terminal of each blasting cap of the gun assembly is grounded. A second terminal of each blasting cap is connected through an electronic switch to the output of a diode, with the input of the diode being connected to the logging cable. The polarity of the diodes are arranged in alternative sequence. The gate of the electronic switch is also connected to the diode through a large resistor and to the ground or a dart through another resistor. These electronic switches are closed when the gate is grounded. Current can flow through the blasting cap only when the gate is grounded and when the diode associated with the blasting cap is of the appropriate polarity to allow current to pass through.