US4030901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for drawing fibers
Assignee: AT&T Inc
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Filing: 1976-07-19
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Granted: 1977-06-21
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Expires: 1996-07-19
Abstract
Abstract A method for drawing silica fibers utilizing an electrical resistance furnace includes the steps of heating a preform so that it begins to flow forming a fiber; pulling the fiber from the furnace; and flushing the preform and the fiber within the furnace with counteracting inert gas flows, the gas flows protecting the preform and the fiber from contamination. Apparatus used with the above-described method is also disclosed.
Inventors
- 👤 Peter Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:17
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/029; C03B2205/00; C03B2205/60; C03B2205/62; C03B2205/63; C03B2205/80; C03B2205/82; C03B2205/83; C03B2205/90; C03B2205/98; Y; Y10; Y10S; Y10S277/00; Y10S277/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A method for drawing fibers comprising the steps: heating a preform in a furnace so that the preform begins to flow forming a fiber, pulling the fiber from the furnace, and flushing the preform, the fiber and a heater within a chamber located in the furnace with counteracting inert gas flows, by injecting the gas from ports located at opposite ends of the furnace into the chamber and exhausting the gas from the chamber through a port located near the heater within the chamber, the gas flows protecting the preform and the fiber from contamination.
Claim 2
Independent Claim
95 words
A method for drawing fibers comprising the steps: heating a preform in a furnace so that the preform begins to flow forming a fiber, pulling the fiber from the furnace, and flushing the preform, the fiber and a heater within a chamber located in the furnace with counteracting inert gas flows, by injecting the gas from ports located at opposite ends of the furnace into the chamber and exhausting the gas from the chamber through a port located near the heater within the chamber, the gas flows protecting the preform and the fiber from contamination.
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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |