US3880603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated magnetic material
Assignee: Individual
•
Filing: 1973-05-03
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Granted: 1975-04-29
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Expires: 1993-05-03
Abstract
Abstract An extrusion billet is fabricated from layers of soft magnetic material separated by one or more metal layers. The billet is coreduced and heat treated to impart the desired magnetic properties to the soft magnetic material and also to form intermetallic insulating layers between the magnetic layers. Electric field shield sections are formed in a similar manner by placing relatively thick layers of copper between adjacent layers of metal located adjacent to the layers of soft magnetic material. The layers of soft magnetic metal can also be separated by a layer of semiconductor material; or a metal foil having a semiconductor-forming or high electrical resistivity forming material deposited thereon. In the latter case no extrusion is required. Instead, pressure and heat cause the materials to react and form either a semiconductor layer or a layer with an electrical resistivity higher than about 10 4 ohm-cm between adjacent layers of soft magnetic metal. Even the deposition step is eliminated by separating and bonding the layers of soft magnetic metal with glass so long as the glass and soft magnetic metal have similar coefficients of thermal expansion.
Inventors
- 👤 Clayton N Whetsone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:54
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0233; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F1/18; H01F27/00; H01F27/24; H01F27/245; Y; Y10; Y10T; Y10T428/00; Y10T428/11; Y10T428/1107; Y10T428/1121; Y10T428/1129; Y10T428/12; Y10T428/12493; Y10T428/12528; Y10T428/12535; Y10T428/12597; Y10T428/12611; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
42 words
A LAMINATED MAGNETICALLY SOFT MATERIAL COMPRISING: A PLURALITY OF LAYERS OF SUBSTANTIALLY STRESS-FREE MAGNETICALLY SOFT METAL; A LEAST ONE CONTINOUS LAYER OF AN INORGANIC ELECTRICALLY INSULATIVE MATERIAL HAVING A RESISTIVITY OF MORE THAN ABOUT 10**4 OHM-CM LOCATED BETWEEN ADJACENT LAYERS OF SAID
Claim 2
Dependent Claim
42 words
A LAMINATED MAGNETICALLY SOFT MATERIAL COMPRISING: A PLURALITY OF LAYERS OF SUBSTANTIALLY STRESS-FREE MAGNETICALLY SOFT METAL; A LEAST ONE CONTINOUS LAYER OF AN INORGANIC ELECTRICALLY INSULATIVE MATERIAL HAVING A RESISTIVITY OF MORE THAN ABOUT 10**4 OHM-CM LOCATED BETWEEN ADJACENT LAYERS OF SAID
Claim 3
Dependent Claim
26 words
The laminate of claim 1 wherein the coefficients of thermal expansion of said magnetically soft metal and said inorganic electrically insulative material are substantially the same.
Claim 4
Dependent Claim
39 words
The laminate of claim 1 wherein the difference between the coefficient of thermal expansion of said magnetically soft metal and the coefficient of thermal expansion of said inorganic electrically insulative material is less than about 500 parts per million.
Claim 5
Dependent Claim
14 words
The laminate of claim 1 wherein said magnetically soft metal is substantially fully annealed.
Claim 6
Dependent Claim
26 words
The laminate of claim 1 wherein said inorganic electrically insulative material includes a solid compound at least one of the constituents of which is a gas.
Claim 7
Dependent Claim
17 words
The laminate of claim 5 wherein said gas is hydrogen and the solid compound is a hydride.
Claim 8
Dependent Claim
20 words
The laminate of claim 1 wherein said magnetically soft metal consists essentially of 79% nickel, 16% iron, and 4% molybdenum.
Claim 9
Dependent Claim
15 words
The laminate of claim 1 wherein the inorganic resistive material consists essentially of silicon monoxide.
Claim 10
Dependent Claim
35 words
A laminated magnetically soft material comprising: a plurality of layers of magnetically soft metal; and at least one layer of a semiconductor material located between adjacent layers of said magnetically soft metal and heat-bonded thereto.
Claim 11
Dependent Claim
35 words
A laminated magnetically soft material comprising: a plurality of layers of magnetically soft metal; and at least one layer of a semiconductor material located between adjacent layers of said magnetically soft metal and heat-bonded thereto.
Claim 12
Dependent Claim
22 words
The laminate of claim 9 wherein said semiconductor material is comprised of a Group V element reacted with a Group III element.
Claim 13
Dependent Claim
12 words
The laminate of claim 9 wherein said semiconductor material is aluminum arsenide.
Claim 14
Dependent Claim
12 words
The laminate of claim 9 wherein said semiconductor material is aluminum antimonide.
Claim 15
Dependent Claim
16 words
The laminate of claim 9 wherein said semiconductor material consists essentially of a single semiconductor element.
Claim 16
Dependent Claim
10 words
The laminate of claim 13 wherein said element is selenium.
Claim 17
Dependent Claim
14 words
The laminate of claim 9 wherein said magnetically soft metal is substantially fully annealed.
Claim 18
Dependent Claim
26 words
The laminate of claim 9 wherein said layer of semiconductor material includes a soliD compound at least one of the constituents of which is a gas.
Claim 19
Dependent Claim
17 words
The laminate of claim 16 wherein said gas is hydrogen and said solid compound is a hydride.
Claim 20
Dependent Claim
34 words
A laminated magnetically soft material comprising: a plurality of layers of magnetically soft metal; and at least one layer of a glass located between adjacent layers of said magnetically soft metal and heat-bonded thereto.
Claim 21
Dependent Claim
34 words
A laminated magnetically soft material comprising: a plurality of layers of magnetically soft metal; and at least one layer of a glass located between adjacent layers of said magnetically soft metal and heat-bonded thereto.
Claim 22
Dependent Claim
22 words
The laminate of claim 18 wherein the coefficients of thermal expansion of said magnetically soft and said glass are substantially the same.
Claim 23
Dependent Claim
36 words
The laminate of claim 18 wherein the difference between the coefficient of thermal expansion of said magnetically soft metal and the coefficient of thermal expansion of said glass is less than about 500 parts per million.
Claim 24
Dependent Claim
14 words
The laminate of claim 18 wherein said magnetically soft metal is substantially fully annealed.
Claim 25
Dependent Claim
32 words
The laminate of claim 18 wherein said glass includes a modifier to make its coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of said magnetically soft metal.
Claim 26
Dependent Claim
43 words
The laminate of claim 18 wherein said glass includes a modifier so that the difference between the coefficient of thermal expansion of said magnetically soft metal and the coefficient of thermal expansion of said glass is less than about 500 parts per million.
Claim 27
Dependent Claim
75 words
The laminate of claim 18 wherein the mean coefficient of thermal expansion of said magnetically soft metal is between about 12 X 10 7 inches per inch per degree C and 150 X 10 7 inches per inch per degree C; and the mean coefficient of thermal expansion of said glass is between about 5.5 X 10 7 inches per inch per degree C and 150 X 10 7 inches per inch per degree C.
Claim 28
Dependent Claim
14 words
The laminate of claim 1 wherein said inorganic electrically insulative material is a semiconductor.
Claim 29
Dependent Claim
24 words
The laminate of claim 25 wherein the coefficients of thermal expansion of said magnetically soft metal and said semiconductor material are substantially the same.
Claim 30
Dependent Claim
39 words
The laminate of claim 26 wherein the difference between the coefficient of thermal expansion of said soft magnetic metal and the coefficient of thermal expansion of said inorganic electrically insulative material is less than about 500 parts per million.
Claim 31
Dependent Claim
13 words
The laminate of claim 1 wherein said electrically insulative material is a glass.
Claim 32
Dependent Claim
23 words
The laminate of claim 28 wherein the coefficients of thermal expansion of said magnetically soft metal and said glass are substantially the same.
Claim 33
Dependent Claim
35 words
The laminate of claim 29 wherein the difference between the coefficient of thermal expansion of said soft magnetic metal and the coefficient of thermal expansion of said glass is less than about 500 per million.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |