US4456812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser treatment of electrical steel
Assignee: Armco Inc
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Filing: 1982-07-30
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Granted: 1984-06-26
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Expires: 2002-07-30
Abstract
Abstract A process is taught for improving the core loss of magnetic materials of the type having a plurality of magnetic domains and an insulative coating thereon. The insulative coating may be a mill glass, an applied coating, or both. The magnetic material is scanned by the beam of a laser across its rolling direction so as to subdivide the magnetic domains without damage to the insulative coating.
Inventors
- 👤 Gary L. Neiheisel
- 👤 Jerry W. Schoen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:29
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F1/18; B; B23; B23K; B23K26/00; B23K26/08; B23K26/082; B23K26/0821; B23K26/083; B23K26/0838; B23K26/0846; C; C21; C21D; C21D8/00; C21D8/12; C21D8/1294; B23K2103/00; B23K2103/02; B23K2103/04; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/903
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
78 words
A process for improving the core loss of magnetic materials of the type having a plurality of magnetic domains and an insulative coating thereon chosen from the class consisting of a mill glass, an applied coating, and an applied coating over a mill glass, said process comprising the step of momentarily irradiating said magnetic materials having said insulative coating thereon with a continuous wave laser so as to subdivide said magnetic domains without damage to said insulative coating.
Claim 2
Dependent Claim
78 words
A process for improving the core loss of magnetic materials of the type having a plurality of magnetic domains and an insulative coating thereon chosen from the class consisting of a mill glass, an applied coating, and an applied coating over a mill glass, said process comprising the step of momentarily irradiating said magnetic materials having said insulative coating thereon with a continuous wave laser so as to subdivide said magnetic domains without damage to said insulative coating.
Claim 3
Dependent Claim
13 words
The process claimed in claim 1 wherein said laser is a Nd:YAG laser.
Claim 4
Dependent Claim
30 words
The process claimed in claim 1 wherein said magnetic material is chosen from the class consisting of cube-on-edge regular grain oriented silicon steel and cube-on-edge high-permeability grain oriented silicon steel.
Claim 5
Dependent Claim
14 words
The process claimed in claim 1 wherein said magnetic material is cube-on-face silicon steel.
Claim 6
Dependent Claim
13 words
The process claimed in claim 1 wherein said magnetic material is amorphous material.
Claim 7
Dependent Claim
45 words
The process claimed in claim 1 including the step of scanning the beam of said laser across the rolling direction of said magnetic material to form narrow lines of irradiation thereon at an angle of from about 45° to about 90° to said rolling direction.
Claim 8
Dependent Claim
40 words
The process claimed in claim 1 including the step of adjusting the energy per unit vertical area (E/A v ) produced in the magnetic material so as to achieve refinement of the magnetic domains without damage to the insulative coating.
Claim 9
Dependent Claim
56 words
The process claimed in claim 1 including the step of modifying the beam produced by said laser to form an elliptical-shaped spot on the surface of the material being irradiated, the major axis of said elliptical spot extending across the rolling direction of said magnetic material at an angle of from about 45° about 90° thereto.
Claim 10
Dependent Claim
27 words
The process claimed in claim 1 wherein the effective dwell time of the beam produced by said laser is from about 0.001 msec to about 10 msec.
Claim 11
Dependent Claim
32 words
The process claimed in claim 1 wherein the diameter of the beam produced by said laser at the surface of said magnetic material is from about 0.025 mm to about 15 mm.
Claim 12
Dependent Claim
28 words
The process claimed in claim 1 wherein said magnetic material is maintained under an applied tension of from about 3.5 to about 70 MPa during said irradiation thereof.
Claim 13
Dependent Claim
28 words
The process claimed in claim 1 wherein said magnetic material is maintained under an applied tension of from about 10.0 to about 35 MPa during said irradiation thereof.
Claim 14
Dependent Claim
30 words
The process claimed in claim 1 wherein said magnetic material is chosen from the class consisting of cube-on-edge regular grain oriented silicon steel and cube-on-edge high-permeability grain oriented silicon steel.
Claim 15
Dependent Claim
14 words
The process claimed in claim 1 wherein said magnetic material is cube-on-face silicon steel.
Claim 16
Dependent Claim
13 words
The process claimed in claim 1 wherein said magnetic material is amorphous material.
Claim 17
Dependent Claim
45 words
The process claimed in claim 1 including the step of scanning the beam of said laser across the rolling direction of said magnetic material to form narrow lines of irradiation thereon at an angle of from about 45° to about 90° to said rolling direction.
Claim 18
Dependent Claim
40 words
The process claimed in claim 1 including the step of adjusting the energy per unit vertical area (E/A v ) produced in the magnetic material so as to achieve refinement of the magnetic domains without damage to the insulative coating.
Claim 19
Dependent Claim
58 words
The process claimed in claim 1 including the step of modifying the beam produced by said laser to form an elliptical-shaped spot on the surface of the magnetic material being irradiated, the major axis of said elliptical spot extending across the rolling direction of said magnetic material at an angle of from about 45° to about 90° thereto.
Claim 20
Dependent Claim
26 words
The process claimed in claim 1 wherein the effective dwell time of the beam produced by said laser is about 0.001 msec to about 10 msec.
Claim 21
Dependent Claim
32 words
The process claimed in claim 1 wherein the diameter of the beam produced by said laser at the surface of said magnetic material is from about 0.025 mm to about 1.5 mm.
Claim 22
Dependent Claim
28 words
The process claimed in claim 1 wherein said magnetic material is maintained under an applied tension of from about 3.5 to about 70 MPa during said irradiation thereof.
Claim 23
Dependent Claim
28 words
The process claimed in claim 1 wherein said magnetic material is maintained under an applied tension of from about 10.0 to about 35 MPa during said irradiation thereof.
Claim 24
Dependent Claim
21 words
The process claimed in claim 6 wherein said lines of irradiation have a line spacing of at least about 2.0 mm.
Claim 25
Dependent Claim
21 words
The process claimed in claim 16 wherein said line of irradiation have a line spacing of at least about 2.0 mm.
Claim 26
Dependent Claim
12 words
An electrical steel made in accordance with the process of claims 1.
Claim 27
Dependent Claim
75 words
A magnetic material having a plurality of spaced parallel continuous wave laser-refined magnetic domains serving to reduce core loss, said magnetic material having said laser-refined magnetic domains also having an uninterrupted insulative coating thereon, said coating having been formed on said magnetic material prior to said laser refinement of said magnetic domains and having been chosen from the class consisting of a mill glass, an applied coating, and an applied coating over a mill glass.
Claim 28
Dependent Claim
75 words
A magnetic material having a plurality of spaced parallel continuous wave laser-refined magnetic domains serving to reduce core loss, said magnetic material having said laser-refined magnetic domains also having an uninterrupted insulative coating thereon, said coating having been formed on said magnetic material prior to said laser refinement of said magnetic domains and having been chosen from the class consisting of a mill glass, an applied coating, and an applied coating over a mill glass.
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |