Patent US3494191A successfully refreshed from Google Patents.
US3494191A
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Fluid driven surface level sensing system
Assignee: Corning Glass Works
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Filing: 1968-04-05
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Granted: 1970-02-10
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Expires: 1988-04-05
Abstract
No abstract record available.
Inventors
- 👤 Terence J Cawley
- 👤 Paul B Kulik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:28
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14; G01F23/16; G01F23/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |