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Patent US4689443A successfully refreshed from Google Patents.
US4689443A
Expired / Lapsed
US
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Armored cable having mineral insulation
Assignee: US Philips Corp
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Filing: 1985-12-17
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Granted: 1987-08-25
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Expires: 2005-12-17
Abstract
Abstract An armored cable having mineral insulation, comprising a metal central conductor and a cylindrical hollow metal sheath between which a powdered refractory insulating material is interposed, characterized in that the mineral insulating material is a mixture of 10 to 30% by weight of magnesium oxide (MgO) and 70 and 90% by weight of silicon oxide (SiO2).
Inventors
- 👤 Gilles Bailleul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:07
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/16; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49089
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
An armoured cable having mineral insulation, comprising a metal central conductor and a cylindrical hollow metal sheath between which a powdered refractory insulating material is interposed, characterized in that the mineral insulating material is a mixture of 10 to 30% by weight of magnesium oxide (MgO) and of 70 to 90% by weight of silicon oxide (SiO 2 ).
Claim 2
Dependent Claim
59 words
An armoured cable having mineral insulation, comprising a metal central conductor and a cylindrical hollow metal sheath between which a powdered refractory insulating material is interposed, characterized in that the mineral insulating material is a mixture of 10 to 30% by weight of magnesium oxide (MgO) and of 70 to 90% by weight of silicon oxide (SiO 2 ).
Claim 3
Dependent Claim
78 words
An armored cable comprising a metal central conductor, a cylindrical hollow metal sheath and a powdered refractory insulating material consisting essentially of a mixture of 10 to 30% by weight of magnesium oxide (MgO) and 70 to 90% by weight of silicon oxide (SiO 2 ) interposed between said cylindrical hollow metal sheath, said sheath consisting of a layer of iron facing said metal insulating material, an intermediate layer of copper and an outer layer of stainless steel.
Claim 4
Dependent Claim
78 words
An armored cable comprising a metal central conductor, a cylindrical hollow metal sheath and a powdered refractory insulating material consisting essentially of a mixture of 10 to 30% by weight of magnesium oxide (MgO) and 70 to 90% by weight of silicon oxide (SiO 2 ) interposed between said cylindrical hollow metal sheath, said sheath consisting of a layer of iron facing said metal insulating material, an intermediate layer of copper and an outer layer of stainless steel.
Claim 5
Dependent Claim
71 words
An armored cable comprising a central conductor made of copper, a cylindrical hollow metal sheath of an inner layer of iron, an intermediate layer of copper and an outer layer of stainless steel and a powdered refractory insulating material interposed between said central conductor and said cylindrical hollow metal sheath and consisting essentially of 20% by weight of magnesium oxide (MgO) and 80% by weight of silicon oxide (SiO 2 ).
Claim 6
Dependent Claim
71 words
An armored cable comprising a central conductor made of copper, a cylindrical hollow metal sheath of an inner layer of iron, an intermediate layer of copper and an outer layer of stainless steel and a powdered refractory insulating material interposed between said central conductor and said cylindrical hollow metal sheath and consisting essentially of 20% by weight of magnesium oxide (MgO) and 80% by weight of silicon oxide (SiO 2 ).
References Cited (Backward Citations)
US222943A
Cited
US1127281A
Cited
US2351056A
Cited
US2669636A
Cited
US3297818A
Cited
US4087777A
Cited
EP0084171A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |