US3557610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic testing apparatus
Assignee: STD Services Ltd
•
Filing: 1968-03-11
•
Granted: 1971-01-26
•
Expires: 1988-03-11
Abstract
Abstract AN ULTA-SONIC TESTING EQUIPMENT USES A SERIES OF RECEIVING TRANSDUCERS WHICH ARE SCANNED BY A RING COUNTER ARRANGEMENT. THE SIGNALS FROM THE TRANSDUCERS ARE FED TO A VARIABLE GAIN AMPLIFIER. A SERIOS OF SEPARATE PRE-SET GAIN CONTROL CIRCUITS ASSOCIATED WITH THE AMPLIFIER ARE SCANNED IN SYNCHRONISM WITH THE SCANNING OF THE TRANSDUCERS TO ALLOW FOR VARIATIONS IN THE SENSITIVITY OF THE TRANSDUCERS.
Inventors
- 👤 Donald Malcom Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/26; G01N29/262; Y; Y10; Y10S; Y10S73/00; Y10S73/90
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |