Patent US4594088A successfully refreshed from Google Patents.
US4594088A
Expired / Lapsed
US
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Method and apparatus for making, coating and cooling lightguide fiber
Assignee: AT&T Inc
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Filing: 1985-05-28
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Granted: 1986-06-10
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Expires: 2005-05-28
Abstract
Abstract An apparatus (30) for cooling a lightguide fiber (21) drawn from a molten portion of a glass preform (22) located in a furnace (23). The apparatus (30) has an upper chamber (34) and a lower chamber (36) each having a small opening in the lower portions thereof. The upper chamber (34) has a heat transfer liquid (35) therein and the lower chamber (36) is pressurized to prevent liquid from passing through the opening. The hot fiber (21) is cooled by the liquid as it is drawn through liquid (35) without physical contact with the periphery of the openings.
Inventors
- 👤 Un-Chul Paek
- 👤 Charles M. Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:32
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/027; C03B37/02718; C03B2205/00; C03B2205/50; C03B2205/52; C03B2205/53; C03B2205/54; C03B2205/55
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
73 words
A method of fabricating a lightguide fiber, comprising the steps of: drawing the fiber from a heated lightguide preform; moving the fiber into a cooling liquid in an upper chamber having an aperture in the lower portion thereof; and further moving the fiber, cooled by the liquid, through in a non-contact manner the aperture into a lower chamber pressurized with a gas pressure sufficient to substantially prevent liquid from passing through the aperture.
Claim 2
Independent Claim
73 words
A method of fabricating a lightguide fiber, comprising the steps of: drawing the fiber from a heated lightguide preform; moving the fiber into a cooling liquid in an upper chamber having an aperture in the lower portion thereof; and further moving the fiber, cooled by the liquid, through in a non-contact manner the aperture into a lower chamber pressurized with a gas pressure sufficient to substantially prevent liquid from passing through the aperture.
Claim 3
Dependent Claim
43 words
The method as set forth in claim 1, wherein the cooled fiber passes through the pressurized lower chamber and through an opening in a die, located in the bottom portion of the lower chamber, in alignment with the opening in the upper chamber.
Claim 4
Dependent Claim
23 words
The method as set forth in claim 2, wherein: the cooled fiber passes through the openings in spaced relation to the peripheries thereof.
Claim 5
Dependent Claim
34 words
The method as set forth in claim 3, comprising the step of: directing a gas flow at the cooled fiber exiting the die to evaporate any moisture thereon while simultaneously providing supplemental cooling thereto.
Claim 6
Dependent Claim
24 words
The method as set forth in claim 2, comprising the step of: applying a protective coating to the cooled fiber upon exiting the die.
Claim 7
Dependent Claim
26 words
The method as set forth in claim 4, comprising the step of: applying a protective coating to the cooled fiber subsequent to the gas directing step.
Claim 8
Dependent Claim
28 words
The method as set forth in claim 1, which further comprises the step of: substantially eliminating turbulence of the liquid to promote laminar flow in the upper chamber.
Claim 9
Independent Claim
75 words
An apparatus for cooling a lightguide fiber drawn from a heated preform, the apparatus comprising: a housing having an upper and lower chamber; the upper chamber, having a first aperture in the lower portion thereof, being adapted to contain a liquid for cooling the fiber drawn therethrough; and the lower chamber adapted to be pressurized to substantially prevent liquid from flowing through the first aperture as a fiber is drawn therethrough in a non-contact manner.
Claim 10
Independent Claim
75 words
An apparatus for cooling a lightguide fiber drawn from a heated preform, the apparatus comprising: a housing having an upper and lower chamber; the upper chamber, having a first aperture in the lower portion thereof, being adapted to contain a liquid for cooling the fiber drawn therethrough; and the lower chamber adapted to be pressurized to substantially prevent liquid from flowing through the first aperture as a fiber is drawn therethrough in a non-contact manner.
Claim 11
Dependent Claim
29 words
The apparatus as set forth in claim 8, which further comprises: a middle chamber intermediate the upper and lower chamber, to capture any liquid flowing from the upper chamber.
Claim 12
Dependent Claim
27 words
The apparatus as set forth in claim 8, comprising: means for directing gas at the cooled fiber to simultaneously evaporate moisture thereon while providing supplemental cooling thereto.
Claim 13
Dependent Claim
27 words
The apparatus as set forth in claim 9, comprising: means for directing gas at the cooled fiber to simultaneously evaporate moisture thereon while providing supplemental cooling thereto.
Claim 14
Dependent Claim
23 words
The apparatus as set forth in claim 8, comprising: means for applying a protective coating to the cooled fiber upon exiting the housing.
Claim 15
Dependent Claim
25 words
The apparatus as set forth in claim 10, comprising: means for applying a protective coating to the cooled fiber upon exiting the gas directing means.
Claim 16
Dependent Claim
35 words
The apparatus as set forth in claim 8, comprising: a cylindrical screen, located in the upper chamber, through which the fiber is axially drawn, to prevent particulate in the liquid from contact with the fiber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |