US3302746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-excited seismic systems
Assignee: Individual
•
Filing: 1964-03-04
•
Granted: 1967-02-07
•
Expires: 1984-03-04
Abstract
No abstract record available.
Inventors
- 👤 Ikrath Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:53
CPC Classifications
G; G01; G01V; G01V1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A SELF-EXCITED SEISMIC SYSTEM COMPRISING A TUNED SEISMIC TRANSMITTER TRANSDUCER AND A TUNED SEISMIC RECEIVER TRANSDUCER RESTING ON THE EARTH A SHORT DISTANCE APART, A VARIABLE GAIN AMPLIFIER AND A VARIABLE PHASE SHIFTER CONNECTED IN CASCADE BETWEEN THE OUTPUT OF SAID RECEIVER TRANSDUCER AND THE INPUT OF SAID TRANSMITTER TRANS-
Claim 2
Dependent Claim
50 words
A SELF-EXCITED SEISMIC SYSTEM COMPRISING A TUNED SEISMIC TRANSMITTER TRANSDUCER AND A TUNED SEISMIC RECEIVER TRANSDUCER RESTING ON THE EARTH A SHORT DISTANCE APART, A VARIABLE GAIN AMPLIFIER AND A VARIABLE PHASE SHIFTER CONNECTED IN CASCADE BETWEEN THE OUTPUT OF SAID RECEIVER TRANSDUCER AND THE INPUT OF SAID TRANSMITTER TRANS-
References Cited (Backward Citations)
US3031644A
Cited
US2688124A
Cited
US2723387A
Cited
US3220503A
Cited
US3103655A
Cited
US3222664A
Cited
US3278893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |