Patent US4948656A successfully refreshed from Google Patents.
US4948656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminate including sealing liquid between facing surfaces of laminations
Assignee: Armco Inc
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Filing: 1989-07-03
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Granted: 1990-08-14
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Expires: 2009-07-03
Abstract
Abstract Method for forming a laminate and a product formed thereof. A thin layer of oil is applied to a facing surface of at least one a plurality of adjacent laminations. The laminations are passed between a pair of rollers which apply sufficient pressure to remove excess oil between the facing surfaces. The air between the facing surfaces is displaced and the remaining oil forms a seal to prevent reentry of the air. The laminate is tightly held together to permit handling or fabrication without delamination.
Inventors
- 👤 Jerry W. Schoen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:37
CPC Classifications
B; B32; B32B; B32B37/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F1/18; B32B15/00; B32B15/01; B32B37/0038; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T29/49075; Y10T29/49078; Y10T29/49826; Y10T29/49885; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/31551; Y10T428/31641; Y10T428/31678; Y10T428/31714; Y10T428/31844
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
A metallic core comprising: at least one laminate, said laminate including at least two laminations having facing surfaces, said laminations having a thickness of less than about 0.5 mm, said laminations being in point contact with each other over the entire area of said facing surfaces, an oil between said facing surfaces wherein said oil has a viscosity at 24° C. of no more than about 80 cp, said oil completely filling the voids between said contact points over the entire area of said facing surfaces, said oil forming a seal to prevent reentry of air previously displaced from between said facing surfaces when said facing surfaces are brought into contact with one another, whereby the core is formed without delamination of said laminations of said laminate.
Claim 2
Dependent Claim
127 words
A metallic core comprising: at least one laminate, said laminate including at least two laminations having facing surfaces, said laminations having a thickness of less than about 0.5 mm, said laminations being in point contact with each other over the entire area of said facing surfaces, an oil between said facing surfaces wherein said oil has a viscosity at 24° C. of no more than about 80 cp, said oil completely filling the voids between said contact points over the entire area of said facing surfaces, said oil forming a seal to prevent reentry of air previously displaced from between said facing surfaces when said facing surfaces are brought into contact with one another, whereby the core is formed without delamination of said laminations of said laminate.
Claim 3
Dependent Claim
23 words
A core as set forth in claim 1 wherein said laminations are grain oriented steel and said surfaces include a glass insulating coating.
Claim 4
Dependent Claim
16 words
A core as set forth in claim 1 wherein the core is a wound electrical transformer.
References Cited (Backward Citations)
US790452A
Cited
US1932308A
Cited
US2904875A
Cited
US3013907A
Cited
US2914840A
Cited
US3301699A
Cited
US3538601A
Cited
US3652355A
Cited
US3819427A
Cited
US3948786A
Cited
US4277530A
Cited
DE3029058A1
Cited
US4565746A
Cited
US4618377A
Cited
US4734975A
Cited
JPH047516A
Cited
JPH07968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |