US2735980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microseconds
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
•
Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:15
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/104; G01V3/108
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
THE METHOD OF DETECTING THE PRESENCE OF A SUBSURFACE CONDUCTING BODY BY APPLYING TO A SELECTED REGION OF GROUND A PRIMARY MAGNETIC FIELD OF SQUARE WAVE FORM AND HAVING A TIME DURATION OF 100 OR MORE MILLISECONDS, AND MEASURING THE RESULTANT MAGNETIC FIELD RESPONSE AFTER A PERIOD OF 50-100 MICROSECONDS FOLLOWING THE INITIAL APPLICATION OF THE SAID PRIMARY FIELD.
Claim 2
Independent Claim
59 words
THE METHOD OF DETECTING THE PRESENCE OF A SUBSURFACE CONDUCTING BODY BY APPLYING TO A SELECTED REGION OF GROUND A PRIMARY MAGNETIC FIELD OF SQUARE WAVE FORM AND HAVING A TIME DURATION OF 100 OR MORE MILLISECONDS, AND MEASURING THE RESULTANT MAGNETIC FIELD RESPONSE AFTER A PERIOD OF 50-100 MICROSECONDS FOLLOWING THE INITIAL APPLICATION OF THE SAID PRIMARY FIELD.
References Cited (Backward Citations)
US1748659A
Cited
US2104440A
Cited
US2239466A
Cited
US2278506A
Cited
US2527559A
Cited
US2644130A
Cited
US2685058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |