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
Austenitic stainless steel welding wire and welding structure
Display screen or portion thereof with graphical user interface
Method and apparatus for belling plastic pipe
Managing multiple web services on a single device
Electrophotographic photoreceptor, image-forming apparatus, and electrophotographic cartridge
Antenna device and wireless communication apparatus
Radiation detector array
  Randomly Featured Patents
Readout of a densely packed CCD
Solder-ball bonding device and method
Method for producing a colorimetric resonant reflection biosensor on rigid surfaces
Integrated mask-programmable logic devices with multiple metal levels and manufacturing process thereof
Irregular shaped copper particles and methods of use
System and method for confirmationally-flexible molecular identification
Method and system for determining when to reposition a physiological sensor
Wiper coupler and wiper assembly incorporating same
Clutch
Insect and reptile barrier for outdoorsmen