Resources Contact Us Home
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
Artifact removal in nuclear images
Disk array apparatus and firmware update method therefor
Method for dynamic multi-level pricing for wireless communications according to quality of service
Simultaneous wafer bonding and interconnect joining
Chip on chip semiconductor device including an underfill layer having a resin containing an amine-based curing agent
Powder pulverising device
System and method for netbackup data decryption in a high latency low bandwidth environment
  Randomly Featured Patents
Drive for a circular magazine of a slide projector
Centrifuge blade design and control mechanism
Recording method
Resonator filter
Method of manufacturing hollow resin molding
Carbon baking furnace
Plates comprising a photopolymerizable composition coated on a substrate
Method and apparatus for sampling cervical tissue
Container for retaining liquids and method of using the same
Detecting a short circuit fault in a dynamo electric machine