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US3615919A
Expired / Lapsed
US
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Reactive aluminum nitrate edge coatings for electrical steels
Assignee: Westinghouse Electric Corp
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Filing: 1969-09-30
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Granted: 1971-10-26
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Expires: 1989-09-30
Abstract
Abstract A process is described for preventing the adherence of the bottom edge of adjacent convolutions of a coil of silicon steel during final box annealing to produce a cube-on-face texture. The steps include the formulation of a reactive solution of aluminum nitrate, the application of said solution to a predetermined area and drying the same prior to the application of a nonreactive insulation coating thereto.
Inventors
- 👤 Norman Pavlik
- 👤 George W Weiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:39
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/68; C21D1/70
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
26 words
The method of claim 1 in which said solution is applied in a stripe extending about 1 inch wide from the bottom edge of the coil.
Claim 2
Dependent Claim
29 words
The method of claim 1 in which the solution applied to the predetermined area is dried at a temperature within the range between about 125* and about 200* C.
Claim 3
Dependent Claim
32 words
The method of claim 1 in which the solution is prepared to have an aluminum nitrate concentration within the range between about 200 grams and about 300 grams per liter of water.
Claim 4
Dependent Claim
140 words
In the method of preventing the bottom edges of the convolutions of a coil of an iron-silicon alloy from adhering to one another after annealing at a temperature of about 1,200* C. for producing a cube-on-face texture and in which at least one side of each convolution of the coil is treated with a mixture of polyvinyl alcohol, water and alumina for preventing adhesion of the respective convolutions during annealing, the improvement comprising, making a solution containing between about 200 grams and about 300 grams of aluminum nitrate per liter of water, applying a stripe extending about 1 inch from the bottom edge of the coil to each side of each convolution of said bottom edge and drying said solution at a temperature within the range between about 125* and about 200* C. before applying said water-alcohol alumina mixture thereto.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |