US3930905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing an object of silicon steel
Assignee: ABB Norden Holding AB
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Filing: 1973-10-11
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Granted: 1976-01-06
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Expires: 1993-10-11
Abstract
Abstract A steel object, such as sheet and strip for motors, is provided with a heat-resistant, electrically insulating coating in the form of a layer of calcium titanate. An intermediate layer of silicate may be provided between the steel surface of the object and the layer of titanate. The intermediate layer is preferably a silicate of one or more alkaline earth metals or of aluminum, and especially a silicate of magnesium. The coating of calcium titanate may also contain a vanadium compound. Likewise, a layer of phosphate may be provided on the outside of the layer of titanate.
Inventors
- 👤 Carl-Artur Akerblom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:09
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775; H01F1/14783; C; C23; C23C; C23C24/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
31 words
An object of silicon steel having a heat-resistant, electrically insulating coating firmly thereto, said heat-resistant, insulating coating comprising a layer of a thickness of 0.1-5 microns consisting essentially of calcium titanate.
Claim 2
Dependent Claim
31 words
An object of silicon steel having a heat-resistant, electrically insulating coating firmly thereto, said heat-resistant, insulating coating comprising a layer of a thickness of 0.1-5 microns consisting essentially of calcium titanate.
Claim 3
Dependent Claim
26 words
An object according to claim 1, having an intermediate layer consisting essentially of silicate between the steel surface of the object and the layer of titanate.
Claim 4
Dependent Claim
30 words
An object according to claim 2, in which the intermediate layer consists essentially of a silicate of a substance selected from the group consisting of alkaline earth metals and aluminum.
Claim 5
Dependent Claim
17 words
An object according to claim 2, in which the intermediate layer consists essentially of a magnesium silicate.
Claim 6
Dependent Claim
24 words
An object according to claim 1, in which the layer of calcium titanate is in direct contact with the steel surface of the object.
Claim 7
Dependent Claim
57 words
An object according to claim 1, in which the coating comprises a vanadium compound derived from a vanadium compound selected from the group consisting of vanadium (V) oxide and alkaline earth metal vanadates in an amount which stoichometrically corresponds to at least 0.001 g V 2 O 5 per square meter of the surface of the object.
Claim 8
Dependent Claim
45 words
An object according to claim 2, in which the quantity of titanate in the coating stoichiometrically corresponds to 5 - 100 parts by weight TiO 2 for 100 parts by weight MgO or the equivalent quantity of another compound in the intermediate layer of silicate.
Claim 9
Dependent Claim
17 words
An object according to claim 1, having a layer of a phosphate outside the layer of titanate.
Claim 10
Dependent Claim
57 words
An object according to claim 2, in which the coating comprises a vanadium compound derived from a vanadium compound selected from the group consisting of vanadium (V) oxide and alkaline earth metal vanadates in an amount which stoichometrically corresponds to at least 0.001 g V 2 O 5 per square meter of the surface of the object.
Claim 11
Dependent Claim
17 words
An object according to claim 2 having a layer of a phosphate outside the layer of titanate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |