Patent US2990543A successfully refreshed from Google Patents.
US2990543A
Expired / Lapsed
US
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Sensing the presence or absence of material
Assignee: ACOUSTICA ASSOCIATES Inc
•
Filing: 1956-05-18
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Granted: 1961-06-27
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Expires: 1976-05-18
Abstract
No abstract record available.
Inventors
- 👤 Robert L Rod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:33
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/296; G01F23/2965; G01F23/2961; G01N; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02836; Y; Y10; Y10S; Y10S367/00; Y10S367/908
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2704455A
Cited
US1789369A
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US2105479A
Cited
US2484623A
Cited
US2711646A
Cited
US2787160A
Cited
US2808581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |