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US3658680A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for forming silicon carbide filaments

Assignee: Thales SA
•
Filing: 1969-08-22
•
Granted: 1972-04-25
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Expires: 1989-08-22
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Abstract

Abstract Apparatus to form silicon carbide filaments which are essentially uniform throughout their cross-section, which includes a reaction chamber, a thermal screen surrounding the reaction chamber to equalize the temperature therein, a thermal gradient oven concentric with the thermal screen and surrounding the chamber, and a plurality of thermocouples located in the chamber and sensing temperature, and controlling the oven to provide for essentially uniform temperature distribution within the oven, the chamber having inlet means for the admission of organosilane so that conversion of heated tungsten to tungsten carbide is carried out essentially at uniform temperatures throughout the entire chamber; an electrolytic cell follows the chamber in the path of the filament.

Inventors

  • 👤 Christian Combe
  • 👤 Andre Clouet
  • 👤 Michel Marchal
  • 👤 Michel Villard
  • 👤 Pierre Grenier

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 16:37
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/977; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/32; C23C16/325; C23C16/44; C23C16/54; C23C16/545; C23C16/56; C01P; C01P2002/00; C01P2002/60; C01P2004/00; C01P2004/10; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/90

Claims Analysis

Total Claims: 1
Claim 1
Independent Claim 42 words
Apparatus according to claim 1, including means (5, 6) supplying a gaseous silane mixture to the chamber, said means comprising an insulated vessel (5) and a thermostatically controlled bath (6) surrounding said insulated vessel and maintaining the temperature of said vessel constant.

References Cited (Backward Citations)

US1077696A Cited
US1731269A Cited
GB402893A Cited
US3409469A Cited
US3424603A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-04-25 1975-10-25 1976-04-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-04-25 1979-10-25 1980-04-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-04-25 1983-10-25 1984-04-25 $7700.00 Window Closed / Lapsed

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