Patent US2689042A successfully refreshed from Google Patents.
US2689042A
Expired / Lapsed
US
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Magnetic hardness tester
Assignee: Motors Liquidation Co
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Filing: 1950-05-11
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Granted: 1954-09-14
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Expires: 1970-05-11
Abstract
No abstract record available.
Inventors
- 👤 Milton J Diamond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:15
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2312357A
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GB581964A
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US2423534A
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US2357745A
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US2427774A
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US2554329A
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US2527797A
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US2444751A
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US2504731A
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US2566767A
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US2534958A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |