 |
|
 |
| |
 |
|
Class Information
Number: 250/262
Name: Radiant energy > Geological testing or irradiation > Well testing apparatus and methods > With particular detector signal circuit
Description: Subject matter wherein the means to detect radiation emitted naturally or radiation modified or caused by material interacting with radiation includes a radiation detector and a detailed electrical circuit connected between the detector and an indicator or recorder of the radiation sensed by the detector and includes methods corresponding to the apparatus.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4292518 |
Methods and apparatus for measuring thermal neutron decay characteristics of earth formations |
Sep. 29, 1981 |
| 4284886 |
Random pulsing of neutron source for inelastic neutron scattering gamma ray spectroscopy |
Aug. 18, 1981 |
| 4271356 |
Method and apparatus for natural gamma ray spectrum analysis using microprocessor stripper |
Jun. 2, 1981 |
| 4267447 |
Methods and apparatus for measuring thermal neutron decay characteristics of earth formations |
May. 12, 1981 |
| 4239965 |
Method and apparatus for neutron induced gamma ray logging for direct porosity identification |
Dec. 16, 1980 |
| 4224516 |
Methods and apparatus for measuring thermal neutron decay characteristics of earth formations |
Sep. 23, 1980 |
| 4223218 |
Methods and apparatus for optimizing measurements of thermal neutron decay characteristics |
Sep. 16, 1980 |
| 4220851 |
Gain stabilization for radioactivity well logging apparatus |
Sep. 2, 1980 |
| 4208580 |
Lithology determination from the calcium and magnesium activation lines |
Jun. 17, 1980 |
| 4189705 |
Well logging system |
Feb. 19, 1980 |
| 4157469 |
Pulsed neutron well logging apparatus having means for determining background radiation |
Jun. 5, 1979 |
| 4135087 |
Method and apparatus for neutron induced gamma ray logging for lithology identification |
Jan. 16, 1979 |
| 4122338 |
Thermal neutron die away logging system with optimized gating |
Oct. 24, 1978 |
| 4097737 |
Epithermal die-away porosity logging |
Jun. 27, 1978 |
| 4096385 |
Clay content determination by natural gamma ray spectrometry |
Jun. 20, 1978 |
| 4071755 |
Method for in situ evaluation of the source rock potential of earth formations |
Jan. 31, 1978 |
| 4066892 |
Coal logging system |
Jan. 3, 1978 |
| 4055763 |
Neutron characteristic and spectroscopy logging methods and apparatus |
Oct. 25, 1977 |
| 4053767 |
Method and apparatus for stabilizing signals in radioactive well logging tools |
Oct. 11, 1977 |
| 4046764 |
Method and apparatus for measuring the thermal neutron absorption rate in earth formations |
Sep. 6, 1977 |
| 4041309 |
Background subtraction system for pulsed neutron logging of earth boreholes |
Aug. 9, 1977 |
| 4031367 |
Methods and apparatus for pulse height analyzer offset control |
Jun. 21, 1977 |
| 4020342 |
Earth formation salinity by comparison of inelastic and capture gamma ray spectra |
Apr. 26, 1977 |
| 4004147 |
Logging subsurface formations for porosity |
Jan. 18, 1977 |
| 4002904 |
Simultaneous thermal neutron lifetime and boron content well log |
Jan. 11, 1977 |
| 4002903 |
Simultaneous thermal neutron decay time and shale compensated chlorine log system |
Jan. 11, 1977 |
| 3976878 |
Natural gamma ray spectrum analysis technique |
Aug. 24, 1976 |
| 3971935 |
Two detector pulsed neutron porosity and water salinity apparatus and methods |
Jul. 27, 1976 |
| 3959648 |
Dual spectra well logging system and method |
May. 25, 1976 |
| 3946226 |
Well logging method and apparatus |
Mar. 23, 1976 |
| 3943362 |
Simultaneous oxygen and silicon neutron activation well log using pulsed neutron source |
Mar. 9, 1976 |
| 3940611 |
Method for determining thermal neutron decay times of earth formations |
Feb. 24, 1976 |
| 3940613 |
Three frequency modulated thermal neutron lifetime log |
Feb. 24, 1976 |
| 3940610 |
Natural gamma radiation borehole logging system |
Feb. 24, 1976 |
|
|
|
 |
|
 |
|
| |
Randomly Featured Patents |
|
