US3015477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal-rock sensing device
Assignee: General Dynamics Corp
•
Filing: 1958-08-20
•
Granted: 1962-01-02
•
Expires: 1978-08-20
Abstract
No abstract record available.
Inventors
- 👤 Sten I Persson
- 👤 Charles H Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:29
CPC Classifications
E; E21; E21C; E21C39/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB649242A
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US2626982A
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US2639858A
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GB794258A
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US2873425A
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US2901740A
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US2812491A
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US2922148A
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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) | 1965-01-01 | 1965-07-03 | 1966-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-01 | 1969-07-03 | 1970-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-01 | 1973-07-03 | 1974-01-02 | $7700.00 | Window Closed / Lapsed |