US3578982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion protection for metal enclosures for electrical equipment
Assignee: Cooper Power Acquisition Corp
•
Filing: 1968-07-30
•
Granted: 1971-05-18
•
Expires: 1988-07-30
Abstract
Abstract Disclosed herein is a metallic enclosure for electrical equipment used in an underground electrical distribution system which is isolated from the electrical distribution system ground and made cathodic by connecting the enclosure to a consumable anode buried in the ground in close proximity to the metallic enclosure.
Inventors
- 👤 Rolland D Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:00
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
31 words
Apparatus accOrding to claim 1 wherein said means for providing a potential difference comprises: forming said anode from a metal higher in the electromotive series than the metal of said enclosure.
Claim 2
Dependent Claim
13 words
Apparatus according to claim 1 wherein said plate is formed of stainless steel.
Claim 3
Dependent Claim
55 words
In an electrical distribution system having an underground transformer grounded by a copper ground rod buried in a spaced relation to the transformer, means for protecting said transformer comprising: a metal enclosure surrounding the transformer and isolated therefrom; means anodic with respect to said enclosure; and circuit means connecting said anodic means to said enclosure.
Claim 4
Dependent Claim
32 words
In an electrical distribution system according to claim 4 wherein said anodic means comprises: a metal plate formed from a material higher in the electromotive series than the metal of said enclosure.
Claim 5
Dependent Claim
36 words
In an electrical distribution system according to claim 5 wherein the material for said metal plate is selected from the group consisting of aluminum, zinc and magnesium and said enclosure is formed from a ferrous metal.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |