US2981111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument for indicating fluid density
Assignee: Bill Jack Scientific Instrument Co
•
Filing: 1957-02-28
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Granted: 1961-04-25
•
Expires: 1977-02-28
Abstract
No abstract record available.
Inventors
- 👤 Charles G Mcilwraith
- 👤 John B Breazeale
- 👤 Edward N Dacus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:56
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/10; G01N9/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1589039A
Cited
US2451036A
Cited
US2559919A
Cited
US2571863A
Cited
US2635461A
Cited
US2775126A
Cited
US2788664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |