US3904444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for heat treatment for protected electric elements having a mineral insulator in a rust-proof covering
Assignee: Cables de Lyon SA
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Filing: 1974-04-23
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Granted: 1975-09-09
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Expires: 1994-04-23
Abstract
Abstract This method for heat treatment for protected electric elements comprising at least a conductive core, a coating of an insulating mineral substance and a covering made of a rust-proof substance, is applied between two successive drawing operations of a rough from which the said elements are made. The essential part of the method consists in re-heating separately the covering and the core, the rough tempered on leaving the re-heating operations. This method may be applied, by means of a device comprising a high frequency furnace, a thermally controlled enclosure and tempering enclosure, to any protected element having a rust-proof covering.
Inventors
- 👤 Yves Grange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:14
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/06; C21D9/00; C21D9/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
HEAT TREATMENT METHOD FOR PROTECTED ELEMENTS HAVING AT LEAST ONE CONDUCTIVE CORE, A COATING OF AN INSULATING MINERAL SUBSTANCE AND AN OUTSIDE COVERING MADE OF A RUST-PROOF SUBSTANCE, THE SAID ELEMENTS UNDERGOING SEVERAL DRAWING OPERATIONS, A SUITABLE HEAT TREATMENT BEING EFFECTED BETWEEN TWO SUCCESSIVE DRAWING OPERATIONS, THE SAID METHOD COMPRISING THE STEPS OF A. ANNEALING THE COVERING, B. ANNEALING OFTHE CORES, AND C. TEMPERING OF THE SAID COVERING AND SAID CORES.
Claim 2
Dependent Claim
71 words
HEAT TREATMENT METHOD FOR PROTECTED ELEMENTS HAVING AT LEAST ONE CONDUCTIVE CORE, A COATING OF AN INSULATING MINERAL SUBSTANCE AND AN OUTSIDE COVERING MADE OF A RUST-PROOF SUBSTANCE, THE SAID ELEMENTS UNDERGOING SEVERAL DRAWING OPERATIONS, A SUITABLE HEAT TREATMENT BEING EFFECTED BETWEEN TWO SUCCESSIVE DRAWING OPERATIONS, THE SAID METHOD COMPRISING THE STEPS OF A. ANNEALING THE COVERING, B. ANNEALING OFTHE CORES, AND C. TEMPERING OF THE SAID COVERING AND SAID CORES.
Claim 3
Dependent Claim
28 words
Heat treatment method according to claim 1, characterized in that the step of annealing the covering is carried out by passing the element through a high frequency furnace.
Claim 4
Dependent Claim
31 words
Heat treatment method according to claim 1, characterized in that the step of the annealing the cores of the element is effected by passing said element through a thermally controlled enclosure.
Claim 5
Dependent Claim
28 words
Heat treatment method according to claim 1, characterized in that the step of tempering the covering and cores is carried out by spraying said element with a coolant.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |