US3644658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encased fluid filled transformer
Assignee: Individual
•
Filing: 1970-06-04
•
Granted: 1972-02-22
•
Expires: 1990-06-04
Abstract
Abstract Fluid filled electrical apparatus, such as transformers, and methods of constructing same, suitable for underground or vault mounting. The electrical apparatus includes a metallic tank or casing formed of mild or plain carbon steel, which has a sprayed metallic coating of corrosion-resistant material disposed on the external surfaces thereof.
Inventors
- 👤 Albert J Kuti
- 👤 Thomas C Junk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:40
CPC Classifications
H; H01; H01F; H01F41/00; H01F27/00; H01F27/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
Electrical apparatus comprising: a metallic casing, an electrically conductive element disposed in said casing, said electrically conductive element being adapted for connection to an electrical potential, and fluid means disposed in said casing, the external surfaces of said metallic casing having a sprayed metal coating disposed thereon, with the metal being selected for its ability to resist corrosion, and a protective coating disposed on said sprayed metal coating which impregnates the pores of the sprayed metal coating and provides a protective outer coating on said casing.
Claim 2
Dependent Claim
86 words
Electrical apparatus comprising: a metallic casing, an electrically conductive element disposed in said casing, said electrically conductive element being adapted for connection to an electrical potential, and fluid means disposed in said casing, the external surfaces of said metallic casing having a sprayed metal coating disposed thereon, with the metal being selected for its ability to resist corrosion, and a protective coating disposed on said sprayed metal coating which impregnates the pores of the sprayed metal coating and provides a protective outer coating on said casing.
Claim 3
Dependent Claim
21 words
The electrical apparatus of claim 1 wherein the sprayed metal coating is a steel alloy containing at least 12 percent chromium.
Claim 4
Dependent Claim
25 words
The electrical apparatus of claim 1 wherein the metallic casing is formed of carbon steel and the sprayed metal coating is formed of stainless steel.
Claim 5
Dependent Claim
45 words
The electrical apparatus of claim 1 wherein the protective coating includes first and second coats, with the first coat providing the function of sealing the pores of the sprayed metal coating and promoting adhesion of the second coat, said second coat including an organic resin.
Claim 6
Dependent Claim
32 words
The electrical apparatus of claim 1 wherein the metallic casing is formed of carbon steel, the sprayed metal coating is formed of stainless steel, and the protective coating includes an organic resin.
Claim 7
Dependent Claim
18 words
The electrical apparatus of claim 1 wherein the sprayed metal coating is about 0.010 to 0.015 inch thick.
Claim 8
Dependent Claim
15 words
The electrical apparatus of claim 1 wherein the electrically conductive element includes electrical transformer windings.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |