US2744233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting flaws in metal stock
Assignee: Associated Spring Corp
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Filing: 1952-05-26
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Granted: 1956-05-01
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Expires: 1972-05-26
Abstract
No abstract record available.
Inventors
- 👤 John O Paivinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:32
CPC Classifications
G; G01; G01N; G01N22/00; G01N22/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
APPARATUS FOR INDICATING THE PRESENCE OF PHYSICAL DEFECTS IN ELONGATED METALLIC STOCK SUCH AS WIRE, BARS, TUBES AND THE LIKE, COMPRISING A SOURCE OF HIGH RADIO FREQUENCY ENERGY, A SOURCE OF LOWER RADIO FREQUENCY ENERGY, TWO RADIO FREQUENCY BRIDGES RESPECTIVELY CONNECTED ACROSS THE OUTPUTS OF SAID SOURCES, TWO CONCENTRIC CYLINDRICAL INDUCTION COILS EACH CONNECTED IN AN ARM OF ONE OF THE BRIDGES AND DEFINING AN OPEN PASSAGE THROUGH WHICH THE STOCK MAY BE PASSED, A PARALLEL TANK CIRCUIT CONNECTED IN SERIES WITH THE HIGH FREQUENCY COIL AND TUNED TO RESONANCE
Claim 2
Dependent Claim
90 words
APPARATUS FOR INDICATING THE PRESENCE OF PHYSICAL DEFECTS IN ELONGATED METALLIC STOCK SUCH AS WIRE, BARS, TUBES AND THE LIKE, COMPRISING A SOURCE OF HIGH RADIO FREQUENCY ENERGY, A SOURCE OF LOWER RADIO FREQUENCY ENERGY, TWO RADIO FREQUENCY BRIDGES RESPECTIVELY CONNECTED ACROSS THE OUTPUTS OF SAID SOURCES, TWO CONCENTRIC CYLINDRICAL INDUCTION COILS EACH CONNECTED IN AN ARM OF ONE OF THE BRIDGES AND DEFINING AN OPEN PASSAGE THROUGH WHICH THE STOCK MAY BE PASSED, A PARALLEL TANK CIRCUIT CONNECTED IN SERIES WITH THE HIGH FREQUENCY COIL AND TUNED TO RESONANCE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |