US3691040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical shield for cathodic protection systems
Assignee: Pennwalt Corp
•
Filing: 1970-04-08
•
Granted: 1972-09-12
•
Expires: 1990-04-08
Abstract
Abstract A CATHODIC PROTECTION SYSTEM FOR IMPROVEMENT OF CATHODIC PROTECTION CURRENT DISTRIBUTION AT THE JUNCTION OF INTERSECTING METALLIC STRUCTURES WHICH HOLD ELECTROLYTE. ELECTRICALLY INSULATIVE SHIELDS ARE EXTENDED FROM AT LEAST ONE OF THE INTERSECTING SURFACES AT THE JUNCTION IN SPACED DISPOSITION FROM THE ANODE. WHERE THE INTERSECTING SURFACES ARE DISSIMILAR METALS, THE ELECTRICAL SHIELD IS APPLIED TO THE SURFACES OF THE LESS NOBLE METAL.
Inventors
- 👤 Leon P Sudrabin
- 👤 Harry Neugold Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:04
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |