US2548696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark-gap liquid level indicator
Assignee: Dow Chemical Co
•
Filing: 1947-10-20
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Granted: 1951-04-10
•
Expires: 1967-10-20
Abstract
No abstract record available.
Inventors
- 👤 Ormond E Barstow
- 👤 Clarence A Pippin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:53
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1503479A
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US1928016A
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US2032016A
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US2243425A
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US2175009A
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US2293079A
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US2259958A
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US2246907A
Cited
US2398341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |