US2952157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Specific gravity measuring device
Assignee: Cleveland Cliffs Iron Co
•
Filing: 1956-07-17
•
Granted: 1960-09-13
•
Expires: 1976-07-17
Abstract
No abstract record available.
Inventors
- 👤 Jr John E Hayden
- 👤 Guy R Pitmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:35
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1618442A
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US2003759A
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US2065695A
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US2056187A
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GB509906A
Cited
US2211748A
Cited
US2357639A
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US2550031A
Cited
US2617305A
Cited
US2584945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |