US2803797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for indicating cathodic protection
Assignee: Individual
•
Filing: 1953-09-17
•
Granted: 1957-08-20
•
Expires: 1973-09-17
Abstract
No abstract record available.
Inventors
- 👤 James R Cowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:56
CPC Classifications
G; G01; G01N; G01N17/00; G01N17/02; G01R; G01R27/00; G01R27/02; G01R27/16; G01R27/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1962696A
Cited
US2183531A
Cited
US2344672A
Cited
US2371658A
Cited
US2556705A
Cited
US2694179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |