Patent US3383520A successfully refreshed from Google Patents.
US3383520A
Expired / Lapsed
US
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Utilization of the electrical neutral with cathodic protection
Assignee: Individual
•
Filing: 1964-03-09
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Granted: 1968-05-14
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Expires: 1984-03-09
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:32
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/06; F; F16; F16L; F16L58/00; C23F2213/00; C23F2213/20; C23F2213/21; C23F2213/30; C23F2213/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
IN CATHODIC PROTECTION FOR UNDERGROUND STRUCTURES INCLUDING AN ELECTRICAL POWER CIRCUIT HAVING A NEUTRAL CONDUCTOR, A WATER PIPE AND A GAS PIPE ELECTRICALLY CONNECTED TO SAID NEUTRAL CONDUCTOR AND A SACRIFICIAL ANODE, THE IMPROVEMENT COMPRISING A CATHODE LEAD CONNECTING SAID
Claim 2
Dependent Claim
40 words
IN CATHODIC PROTECTION FOR UNDERGROUND STRUCTURES INCLUDING AN ELECTRICAL POWER CIRCUIT HAVING A NEUTRAL CONDUCTOR, A WATER PIPE AND A GAS PIPE ELECTRICALLY CONNECTED TO SAID NEUTRAL CONDUCTOR AND A SACRIFICIAL ANODE, THE IMPROVEMENT COMPRISING A CATHODE LEAD CONNECTING SAID
References Cited (Backward Citations)
US1481289A
Cited
US1962696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |