US3264475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for calibrating a radioactive logging system
Assignee: Atlantic Richfield Co
•
Filing: 1962-12-31
•
Granted: 1966-08-02
•
Expires: 1982-12-31
Abstract
No abstract record available.
Inventors
- 👤 Dale H Reed
- 👤 Henry F Dunlap
- 👤 Thomas S Hutchinson
- 👤 Robert E Mccallum
- 👤 William C Pritchett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:43
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/101
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
148 words
A METHOD FOR CALIBRATING A RADIOACTIVE LOGGING SONDE, INCLUDING A DETECTOR HAVING A CRYSTAL CAPABLE OF SCINTILLATING IN RESPONSE TO GAMMA RAYS AND A PHOTOMULTIPLIER CAPABLE OF CONVERTING SAID SCINTILLATIONS TO ELECTRICAL PULSES AND MEANS FOR REJECTING GAMMA RAYS WHOSE ENERGIES VARY FROM A PREDETERMINED ENERGY RANGE COMPRISING (A) CONNECTING A PULSE GENERATOR TO SAID MEANS FOR REJECTING GAMMA RAYS, (B) FEEDING ELECTRICAL PULSES OF PREDETERMINED VOLTAGE PROPORTIONAL TO A FIRST PREDETERMINED ENERGY LEVEL TO SAID MEANS TO REJECTING GAMMA RAYS, (C) ADJUSTING THE OUTPUT OF SAID MEANS FOR REJECTING GAMMA RAYS UNTIL SAID OUTPUT IS INDICATIVE OF REJECTION OF ALL PULSES REPRESENTING ENERGY LEVEL, ENERGIES BELOW SAID PREDETERMINED ENERGY LEVEL, (D) PLACING A SOURCE OF GAMMA RAY ENERGY OF KNOWN STRENGTH WHOSE COUNT RATE RAPIDLY CHANGES AT A PREDETERMINED ENERGY LEVEL ADJACENT SAID CRYSTAL, AND (E) ADJUSTING THE PHOTOMULTIPLIER OUTPUT UNTIL A PREDETERMINED COUNT RATE IS OBTAINED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |