US3663782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated iron core induction corner-heating unit
Assignee: United States Steel Corp
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Filing: 1971-06-10
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Granted: 1972-05-16
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Expires: 1991-06-10
Abstract
Abstract An induction heating unit for the corners of an elongated workpiece of rectangular cross section. The unit has a core formed of iron laminations, and preferably has occasional copper laminations interspersed with the iron laminations. Each lamination has a pair of windows which define a central leg and webs between the window and workpiece. A winding of copper tubing extends around the leg within the windows. The webs form an unbroken wall protecting the winding from exposure to the workpiece.
Inventors
- 👤 William A Emerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:33
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/101; B; B22; B22D; B22D11/00; B22D11/12; B22D11/1213; H05B6/36; H05B6/365
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
A combination as defined in claim 1 comprising in addition occasional copper laminations interspersed with said iron laminations.
Claim 2
Dependent Claim
24 words
A combination as defined in claim 1 comprising in addition a tube fixed to the inside edges of said laminations for circulating cooling water.
Claim 3
Dependent Claim
13 words
A combination as defined in claim 3 in which said tube is countersunk.
Claim 4
Dependent Claim
22 words
A combination as defined in claim 3 in which said tube protrudes into said passage and serves also to guide the workpiece.
Claim 5
Dependent Claim
22 words
A combination as defined in claim 1 in which said core includes mating halves each of similar construction but of opposite hand.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |