Patent US3237447A successfully refreshed from Google Patents.
US3237447A
Expired / Lapsed
US
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Erosion gauge
Assignee: General Dynamics Corp
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Filing: 1962-02-05
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Granted: 1966-03-01
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Expires: 1982-02-05
Abstract
No abstract record available.
Inventors
- 👤 Mckeown Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:49
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/56; G01N2203/00; G01N2203/02; G01N2203/06; G01N2203/0617; G01N2203/0623
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
AN EROSION GAUGE COMPRISING AN ENCLOSURE HAVING AN APERTURED BULKHEAD, A TRANSDUCER PIEZO-ELECTRIC CRYSTAL HAVING A FACE ADJACENT SAID APERTURED BULKHEAD, A TEST MATERIAL ON SAID TRANSDUCER CRYSTAL FACE ADJACENT SAID APERTURED BULKHEAD, A REFERENCE PIEZO-ELECTRIC CRYSTAL NEAR SAID TRANSDUCER CRYSTAL AND HAVING A LOWER RESONANT FREQUENCY THAN SAID TRANSDUCER CRYSTAL, A FIRST OSCILLATOR CIRCUIT CONNECTED TO SAID TRANSDUCER CRYSTAL, A SECOND OSCILLATOR CIRCUIT CONNECTED TO SAID REFERENCE CRYSTAL, AND MEANS CONNECTED TO SAID FIRST AND SECOND OSCILLATORS FOR YIELDING THE FREQUENCY DIFFERENCE BETWEEN SAID FIRST AND SECOND OSCILLATOR, WHEREBY A CHANGE IN SAID FREQUENCY DIFFERENCE IS A MEASURE OF THE EROSION OF SAID TEST MATERIAL.
Claim 2
Dependent Claim
106 words
AN EROSION GAUGE COMPRISING AN ENCLOSURE HAVING AN APERTURED BULKHEAD, A TRANSDUCER PIEZO-ELECTRIC CRYSTAL HAVING A FACE ADJACENT SAID APERTURED BULKHEAD, A TEST MATERIAL ON SAID TRANSDUCER CRYSTAL FACE ADJACENT SAID APERTURED BULKHEAD, A REFERENCE PIEZO-ELECTRIC CRYSTAL NEAR SAID TRANSDUCER CRYSTAL AND HAVING A LOWER RESONANT FREQUENCY THAN SAID TRANSDUCER CRYSTAL, A FIRST OSCILLATOR CIRCUIT CONNECTED TO SAID TRANSDUCER CRYSTAL, A SECOND OSCILLATOR CIRCUIT CONNECTED TO SAID REFERENCE CRYSTAL, AND MEANS CONNECTED TO SAID FIRST AND SECOND OSCILLATORS FOR YIELDING THE FREQUENCY DIFFERENCE BETWEEN SAID FIRST AND SECOND OSCILLATOR, WHEREBY A CHANGE IN SAID FREQUENCY DIFFERENCE IS A MEASURE OF THE EROSION OF SAID TEST MATERIAL.
References Cited (Backward Citations)
US2691111A
Cited
US2877338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |