Method of testing workpieces by means of ultra-sound waves according to the impulse echo method
Abstract
Abstract A METHOD OF AND APPARATUS FOR NON-DESTRUCTIVITY EXAMINING WORKPIECES, ESPECIALLY WELDING SEAMS, BY MEANS OF,ULTRA-SOUND WAVES ACCORDING TO THE IMPULSE-ECHO METHOD, IN WHICH ULTRA-SOUND WAVES ARE EMITTED FROM AT LEAST TWO SEPARATE ULTRA-SOUND EMITTER-RECEIVER ANGULAR TESTING HEADS AND SENT INTO THE WORKPIECE ZONE TO BE EXAMINED IN SUCH A WAY THAT THE SOUND WAVES OF SAID EMITTER-RECEIVERS MEET IN SAID ZONE WHILE SAID EMITTERRECEIVERS ARE SO SPACED FROM THE WORKPIECE ZONE TO BE EXAMINED THAT THE SOUND WAVES FROM ONE EMITTER-RECEIVER REQUIRE MORE TIME TO REACH THE WORKPIECE ZONE TO BE EXAMINED THAN THE SOUND WAVES FROM THE OTHER EMITTERRECEIVER, MEANS BEING PROVIDED FOR RECORDING ECHOES RECEIVED BY SAID EMITTER-RECEIVERS.
Inventors
- 👤 Josef Heseding
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |