US3223519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction furnace
Assignee: Millennium Petrochemicals Inc
•
Filing: 1957-05-20
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Granted: 1965-12-14
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Expires: 1977-05-20
Abstract
No abstract record available.
Inventors
- 👤 George H Schippereit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:27
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/06; C; C21; C21C; C21C5/00; C21C5/52; C21C5/5241; C22; C22B; C22B9/00; C22B9/16; H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/24; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A LOW-FREQUENCY CORELESS INDUCTION FURNACE COMPRISING A CUP-SHAPED METAL CRUCIBLE HAVING AN INNER METAL SURFACE-FORMED FROM A HOLLOW, CYLINDRICALLY SHAPED METAL PART AND A DISK SHAPED METAL BOTTOM, SAID CYLINDRICALLY SHAPED APRT BEING FORMED OF INDIVIDUAL METAL SECTIONS, EACH OF SAID METAL SECTIONS CONSTITUTING A CONTINUOUS AREA RUNNING THE LENGTH OF SAID PART AND SAID SECTIONS BEING INSULATED FROM ONE ANOTHER BY AN ELECTRICALLY NONCONDUCTIVE MATERIAL, SAID CYLINDRICALLY SHAPED PART BEING INSULATED FROM SAID DISK-SHAPED BOTTOM BY AN ELECTRICALLY NONCONDUCTIVE MATERIAL, MEANS SURROUNDING SAID CRUCIBLE FOR PROVIDING AN INDUCED LOW-FREQUENCY ALTERNATING CURRENT TO THE CHARGE CONTAINED WITHIN AND IN CONTACT WITH THE INNER METAL SURFACE OF SAID CRUCIBLE AND MEANS FOR COOLING THE OUTSIDE SURFACE OF SAID CRUCIBLE.
Claim 2
Dependent Claim
118 words
A LOW-FREQUENCY CORELESS INDUCTION FURNACE COMPRISING A CUP-SHAPED METAL CRUCIBLE HAVING AN INNER METAL SURFACE-FORMED FROM A HOLLOW, CYLINDRICALLY SHAPED METAL PART AND A DISK SHAPED METAL BOTTOM, SAID CYLINDRICALLY SHAPED APRT BEING FORMED OF INDIVIDUAL METAL SECTIONS, EACH OF SAID METAL SECTIONS CONSTITUTING A CONTINUOUS AREA RUNNING THE LENGTH OF SAID PART AND SAID SECTIONS BEING INSULATED FROM ONE ANOTHER BY AN ELECTRICALLY NONCONDUCTIVE MATERIAL, SAID CYLINDRICALLY SHAPED PART BEING INSULATED FROM SAID DISK-SHAPED BOTTOM BY AN ELECTRICALLY NONCONDUCTIVE MATERIAL, MEANS SURROUNDING SAID CRUCIBLE FOR PROVIDING AN INDUCED LOW-FREQUENCY ALTERNATING CURRENT TO THE CHARGE CONTAINED WITHIN AND IN CONTACT WITH THE INNER METAL SURFACE OF SAID CRUCIBLE AND MEANS FOR COOLING THE OUTSIDE SURFACE OF SAID CRUCIBLE.
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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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |