US3088068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collar locating system
Assignee: Texaco Inc
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Filing: 1960-01-25
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Granted: 1963-04-30
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Expires: 1980-01-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Hugh E Hall
- 👤 Jr Robert W Pitts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:55
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; E; E21; E21B; E21B47/00; E21B47/09; E21B47/092
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
120 words
A SYSTEM FOR LOCATING CHANGES IN THE AMOUNT OF MAGNETIC MATERIAL IN A BOREHOLE COMPRISING A BRIDGE ASSEMBLY SENSITIVE TO CHANGES IN THE AMOUNT OF MAGNETIC MATERIAL IN THE VICINITY THEREOF, A TRANSMISSION LINE COUPLED TO SAID BRIDGE ASSEMBLY, MEANS FOR APPLYING A VOLTAGE TO SAID LINE, MEANS FOR MOVING SAID BRIDGE ASSEMBLY THROUGH THE BOREHOLE, MEANS FOR ABRUPTLY AND SUDDENLY CHANGING THE IMPEDANCE OF SAID LINE THEREBY ABRUPTLY AND SUDDENLY CHANGING THE VOLTAGE ON SAID LINE, SAID IMPEDANCE CHANGING MEANS COMPRISING A BLOCKING OSCILLATOR AND A HYDROGEN THYRATRON STAGE, SAID BLOCKING OSCILLATOR BEING COUPLED TO THE OUTPUT OF SAID BRIDGE ASSEMBLY, SAID HYDROGEN THYRATRON STAGE BEING OPERATIVELY COUPLED AND RESPONSIVE TO THE OUTPUT OF SAID BLOCKING OSCILLATOR AND HAV-
References Cited (Backward Citations)
US2782365A
Cited
US2817808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |