Patent US2565544A successfully refreshed from Google Patents.
US2565544A
Expired / Lapsed
US
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Cathodic protection and underground metallic structure embodying the same
Assignee: Alcoa Corp
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Filing: 1946-08-28
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Granted: 1951-08-28
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Expires: 1966-08-28
Abstract
No abstract record available.
Inventors
- 👤 Brown Robert Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:58
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/06; C23F2213/00; C23F2213/20; C23F2213/22; C23F2213/30; C23F2213/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A CORROSION-RESISTANT METALLIC UNDERGROUND INSTALLATION, IN COMBINATION, A METALLIC UNDERGROUND STRUCTURE COMPOSED OF METAL CATHODIC TO ALUMINUM, AT LEAST ONE UNDERGROUND ANODE COMPOSED OF ALUMINOUS METAL AND SEPARATE FROM SAID STRUCTURE, AN ELECTRICAL CONNECTION BETWEEN SAID STRUCTURE AND SAID ANODE AND A BACKFILL CONTACT WITH SAID ANODE, SAID BACKFILL COMPRISING A CARRIER PORTION, AN EFFECTIVE AMOUNT OF AT LEAST 1 TO 30 PERCENT BY WEIGHT OF INORGANIC HALIDE AND SUFFICIENT ALKALINE MATERIAL TO IMPART TO THE BACKFILL A PH IN EXCESS OF 7.5.
Claim 2
Dependent Claim
84 words
IN A CORROSION-RESISTANT METALLIC UNDERGROUND INSTALLATION, IN COMBINATION, A METALLIC UNDERGROUND STRUCTURE COMPOSED OF METAL CATHODIC TO ALUMINUM, AT LEAST ONE UNDERGROUND ANODE COMPOSED OF ALUMINOUS METAL AND SEPARATE FROM SAID STRUCTURE, AN ELECTRICAL CONNECTION BETWEEN SAID STRUCTURE AND SAID ANODE AND A BACKFILL CONTACT WITH SAID ANODE, SAID BACKFILL COMPRISING A CARRIER PORTION, AN EFFECTIVE AMOUNT OF AT LEAST 1 TO 30 PERCENT BY WEIGHT OF INORGANIC HALIDE AND SUFFICIENT ALKALINE MATERIAL TO IMPART TO THE BACKFILL A PH IN EXCESS OF 7.5.
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) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |