Patent US2501790A successfully refreshed from Google Patents.
US2501790A
Expired / Lapsed
US
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Photoelectric spark recorder
Assignee: Stanolind Oil and Gas Co
•
Filing: 1944-04-27
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Granted: 1950-03-28
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Expires: 1964-04-27
Abstract
No abstract record available.
Inventors
- 👤 Silverman Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:32
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D1/00; G01D15/00; G01D15/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US620326A
Cited
US2229324A
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US907235A
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FR764846A
Cited
GB432922A
Cited
US2348711A
Cited
US2321605A
Cited
US2303472A
Cited
US2400828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |