US3572099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic non-destructive testing apparatus and method
Assignee: General American Transportation Corp
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Filing: 1968-08-23
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Granted: 1971-03-23
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Expires: 1988-08-23
Abstract
Abstract A CONTINUOUS FREQUENCY-MODULATED ELECTRICAL WAVE HAVING A CONTINUOUS FREQUENCY-MODULATION OF REPETITIVE WAVE SHAPE IS GENERATED AND IS CONVERTED INTO AN ULTRASONIC TRANSMITTED WAVE WHICH IS CONTINUOUS AND FREQUENCYMODULATED OF THE REPETITIVE WAVE SHAPE. THE ULTRASONIC WAVE IS IMPINGED ON AN OBJECT SUCH THAT A SERIES OF ULTRASONIC PULSES EACH CORRESPONDING TO A LAMB WAVE MODE IS INDUCED THEREIN. THE ULTRASONIC PULSES ARE CONVERTED TO ELECTRICAL TEST PULSES WHICH ARE THEN CORRELATED WITH THE MODULATING FREQUENCIES.
Inventors
- 👤 Alfred B Wieczorek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:42
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/34; G01N29/348; G01B; G01B17/00; G01B17/02; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02854
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |