Two-way acoustic telemetering system
Abstract
Abstract 1. IN A SYSTEM FOR TRANSMITTING ACOUSTIC SIGNALS IN EITHER DIRECTION ALONG A STRING OF DRILL PIPE; A PLURALITY OF REPEATERS DISTRIBUTED ALONG SAID PIPE, EACH REPEATER HAVING MEANS ACOUSTICALLY COUPLED TO SAID PIPE FOR RECEIVING ACOUSTIC ENERGY OF A PLURALITY OF NOMINAL FREQUENCIES THEREFROM; MEANS ACOUSTICALLY COUPLED TO SAID PIPE FOR RETRASMITTING ACOUSTIC ENERGY OF A PLURALITY OF NOMINAL FREQUENCIES ALONG SAID PIPE; AND MEANS OPERATING IN DEPENDENCE UPON THE NOMINAL FREQUENCY OF THE ENERGY RECEIVED FOR SELECTING FOR RETRANSMISSION FROM SAID PLURALITY OF NOMINAL FREQUENCIES A SIGNAL HAVING A NOMINAL FREQUENCY DIFFERENT FROM THE NOMINAL FREQUENCY RECEIVED BY THE SAME REPEATER AND DIFFERENT FROM THE NOMINAL FREQUENCY TRANSMITTED BY A NEXT REPEATER ALONG SAID STRING IN THE DIRECTION OF TRANSMISSION TO AVOID INTERFERENCE BETWEEN SIGNALS RECEIVED AT A REPEATER FROM ADJACENT REPEATERS ABOVE AND BELOW THAT SAME REPEATER.
Inventors
- 👤 E Shawhan
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |