US2839722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting stray current corrosion
Assignee: Pure Oil Co
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Filing: 1955-12-21
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Granted: 1958-06-17
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Expires: 1975-12-21
Abstract
No abstract record available.
Inventors
- 👤 Glenn A Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:50
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/04; G; G01; G01V; G01V3/00; G01V3/08; G01V3/082
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |