Patent US3602726A successfully refreshed from Google Patents.
US3602726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anodic or cathodic protection of below grade electrical housings
Assignee: TDK Micronas GmbH
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Filing: 1969-04-01
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Granted: 1971-08-31
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Expires: 1989-04-01
Abstract
Abstract The life of a sacrificial anode is extended by providing an insulating barrier in the bottom of an open-bottom housing. Since the barrier is an electrical insulator, it increases the resistance to any stray current path to the outside of the housing. Thus, the barrier significantly prolongs the life of the sacrificial anode by reducing wasteful or stray currents, to the outside of the housing, which tend to erode the anode.
Inventors
- 👤 John A Toedtman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:28
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
A system for protecting underground vaults for electrical transformer and similar devices, said vault including a plurality of different metals and being subject to flooding and draining by ground water, means for impressing an electromotive force on the entire metallic structure in said vault to make it cathodic with respect to said soil, and means comprising an electrical insulating barrier interposed between said vault and sources of said ground water, said barrier having a drain hole through which said ground water may pass.
Claim 2
Independent Claim
83 words
A system for protecting underground vaults for electrical transformer and similar devices, said vault including a plurality of different metals and being subject to flooding and draining by ground water, means for impressing an electromotive force on the entire metallic structure in said vault to make it cathodic with respect to said soil, and means comprising an electrical insulating barrier interposed between said vault and sources of said ground water, said barrier having a drain hole through which said ground water may pass.
Claim 3
Dependent Claim
23 words
The protection system of claim 1 wherein said electromotive force impressing means comprises a sacrificial anode connected to each of said different metals.
Claim 4
Dependent Claim
27 words
The protection system of claim 2 and a ground rod outside said vault and barrier, an insulated wire running from said ground rod to said sacrificial anode.
Claim 5
Dependent Claim
15 words
The protection system of claim 3 wherein said insulated wire runs through said drain hole.
Claim 6
Dependent Claim
18 words
The protection system of claim 1 wherein said electromotive-force--impressing system comprises a cathodic system completely above the barrier.
Claim 7
Dependent Claim
14 words
The protection system of claim 1 wherein said barrier is completely inside said vault.
Claim 8
Dependent Claim
15 words
The protection system of claim 1 wherein said vault rests on top of said barrier.
Claim 9
Dependent Claim
46 words
The system of claim 1 wherein said electromotive-force-impressing means comprises a sacrificial anode connected to each of said different metals, and a ground rod connected to said anode and metals, at least the part of said ground rod exposed to water inside said vault being insulated.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |