Patent US2797976A successfully refreshed from Google Patents.
US2797976A
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Well surveying instrument
Assignee: Sperry Sun Well Surveying Co
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Filing: 1953-12-03
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Granted: 1957-07-02
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Expires: 1973-12-03
Abstract
No abstract record available.
Inventors
- 👤 Ring Roland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:14
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE482616C
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US1925223A
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US2124892A
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US2152671A
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US2255295A
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US2317632A
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US2313310A
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US2382609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |