Patent US3013256A successfully refreshed from Google Patents.
US3013256A
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US
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Electronic apparatus for sensing the presence or absence of material
Assignee: ACOUSTICA ASSOCIATES Inc
•
Filing: 1957-05-01
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Granted: 1961-12-12
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Expires: 1977-05-01
Abstract
No abstract record available.
Inventors
- 👤 Martin A Damast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:35
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/296; G01F23/2966; G01F23/2967
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1789369A
Cited
US2523363A
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US2664556A
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US2775748A
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US2682026A
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US2800647A
Cited
US2888945A
Cited
US2839695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |