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Patent US3019338A successfully refreshed from Google Patents.
US3019338A
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US
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Thickness detector for coal mining machine
Assignee: Well Surveys Inc
•
Filing: 1957-08-28
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Granted: 1962-01-30
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Expires: 1977-08-28
Abstract
No abstract record available.
Inventors
- 👤 Monaghan Ralph
- 👤 Billy F Wilson
- 👤 Knapp Guenther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:31
CPC Classifications
G; G01; G01B; G01B15/00; G01B15/02; G01B15/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2334262A
Cited
US2536131A
Cited
US2711480A
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US2699328A
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US2643344A
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US2673328A
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US2710925A
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US2742502A
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US2769097A
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GB763667A
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US2850684A
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US2860252A
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US2858424A
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FR1135762A
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US2886764A
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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) | 1965-01-29 | 1965-07-31 | 1966-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-29 | 1969-07-31 | 1970-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-29 | 1973-07-31 | 1974-01-30 | $7700.00 | Window Closed / Lapsed |