US2451036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Specific gravity recorder
Assignee: Standard Oil Development Co
•
Filing: 1944-09-30
•
Granted: 1948-10-12
•
Expires: 1964-09-30
Abstract
No abstract record available.
Inventors
- 👤 John R Martin
- 👤 Forrest B Burrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:31
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1450023A
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GB184789A
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US1546702A
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US1604387A
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US2279254A
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US2248322A
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US2251771A
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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) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |