Apparatus for minimizing drawn filament diameter variation
Patent 4126436 Issued on November 21, 1978. Estimated Expiration Date: 
December 5, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 5, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2958899 3737292 3890127 Method for drawing fibers Patent #: 4030901 InventorAssigneeApplicationNo. 05/857418 filed on 12/05/1977US Classes:65/510, With means for cooling newly formed fiber, filament, or preform (e.g., nascent fiber, etc.)425/66, CONTINUOUS FILAMENT FORMING OR FILM CASTING MEANS WITH STRETCHING MEANS COMPRISING PRODUCT ADVANCING MEANS65/32.5, With forming glass from molten state, with treatment of molten glass, or with drawing of glass in softened state65/434, With quench cooling (e.g., forced air or cryogenic immersion, etc.)65/435, With fiber stretching, drawing, or pulling (e.g., from rod, etc.)65/537From rod stockExaminersPrimary: Lindsay, Robert L.Attorney, Agent or FirmInternational ClassesC03B 37/027 (20060101)C03B 37/014 (20060101) C03B 37/02 (20060101) C03B 37/029 (20060101) AbstractAn apparatus is disclosed for drawing glass optical waveguide filaments having minimal diameter variation. A draw blank is supported within an elongated, heated, tubular muffle which heats the blank to its draw temperature. Gas is supplied to that end of the muffle opposite that from which the filament is drawn. A cylindrically shaped member at least 10 cm long is disposed adjacent to the end of the blank opposite the filament to form with the inner wall of the muffle a thin, cylindrically-shaped channel through which the gas must flow. The gas stream is thus uniformly heated at the time that it reaches the root of the filament so that diameter variations due to gas turbulence are minimized. | |
