Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Seismic recording










Image Number 2 for United States Patent #4782911.

A method and apparatus for indicating the time-break on a seismic record wherein the time-break is marked in response to the rupture of an electric circuit by the explosive charge used to generate the seismic waves. The preferred rupturable electric circuit is connected to the same energy source as the electric detonator used to initiate the explosive charge and the preferred electric detonator is one connected to a high frequency A.C. firing energy source through a transformer, the rupturable electric circuit being the primary or secondary circuit of the transformer.The method is more accurate than the present method of marking the time-break at the initial application of current to the detonator.








 
 
  Recently Added Patents
Method and apparatus for a cryptographically assisted commercial network system designed to facilitate buyer-driven conditional purchase offers
Sensor chip, sensor cartridge, and analysis apparatus
Wireless subscriber managing storage of HARQ packets
Electrode assembly with centrally wound separator member
Inspection systems and methods for detecting defects on extreme ultraviolet mask blanks
Maesa japonica extracts and methods of use
Image forming apparatus
  Randomly Featured Patents
Polygon finder and pruned tree geometric match method
Variable displacement vane compressor
On-axis flex web gimbal
Profile server and profile retrieval apparatus
Moving image editing system and moving image editing method
Flasher bulbs with shunt wiring for use in series connected light string with filament shunting in bulb sockets
Active local area network connector with line interogation
Modular backplane
Method of making color separation plates used as a proof and a positive for making offset printing plates photographically
Portable memory storage device