Patent US4579079A successfully refreshed from Google Patents.
US4579079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for use in coating an elongate filament
Assignee: Corning Inc
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Filing: 1983-11-28
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Granted: 1986-04-01
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Expires: 2003-11-28
Abstract
Abstract To uniformly coat a fiber, it is fed downwards through a passage filled with a coating fluid. The passage has a downwardly tapering lower zone into which fluid is directed from outside the passage uniformly, radially inwardly and downwardly. The fluid directed into the lower zone suppresses turbulence within the fluid at a bottom outlet aperture within the lower zone. The passage at an upper zone is large enough to allow bubbles to float to the surface of the fluid. The arrangement prevents turbulence and air bubbles from causing thinly coated fiber regions which might adversely affect the fiber integrity. The passage is defined by two relatively moveable bodies so that the rate at which the coating fluid is injected into the lower zone can be varied.
Inventors
- 👤 Stanley D. Nundy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:17
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/12; C03C25/18; B; B05; B05C; B05C3/00; B05C3/02; B05C3/12; Y; Y10; Y10S; Y10S118/00; Y10S118/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
241 words
Apparatus for coating a fiber with a fluid, comprising: means for feeding a fiber downwardly along a feed path; a downwardly tapered coating chamber; a circular fiber inlet aperture to the coating chamber at an upper end thereof; an annular fluid inlet aperture to the coating chamber at the upper end thereof, said apertures concentrically located; a fiber exit aperture at a lower end of the coating chamber; a cup; a central valve member, concentrically located in the cup, the cup and the valve member defining therebetween a coating fluid storage chamber terminating at said annular aperture; the valve member having a vertical passage therein terminating at the circular inlet aperture; said coating chamber, said storage chamber and said passage being in fluid communication through the circular and annular inlet apertures, the passage in the fiber inlet aperture having a diameter substantially greater than that of the fiber, and the fiber exit aperture having a diameter marginally greater than that of the fiber whereby, in use, uncoated fiber enters the fluid within the passage and coated fiber exits the fluid at the fiber exit aperture; the improvement comprising said fluid having a free surface in the storage chamber and the passage, and the valve member being vertically reciprocable relative to the cup whereby to change the size of the annular inlet aperture and so function as a regulating valve for coating fluid passing from the storage chamber to the coating chamber.
Claim 2
Dependent Claim
241 words
Apparatus for coating a fiber with a fluid, comprising: means for feeding a fiber downwardly along a feed path; a downwardly tapered coating chamber; a circular fiber inlet aperture to the coating chamber at an upper end thereof; an annular fluid inlet aperture to the coating chamber at the upper end thereof, said apertures concentrically located; a fiber exit aperture at a lower end of the coating chamber; a cup; a central valve member, concentrically located in the cup, the cup and the valve member defining therebetween a coating fluid storage chamber terminating at said annular aperture; the valve member having a vertical passage therein terminating at the circular inlet aperture; said coating chamber, said storage chamber and said passage being in fluid communication through the circular and annular inlet apertures, the passage in the fiber inlet aperture having a diameter substantially greater than that of the fiber, and the fiber exit aperture having a diameter marginally greater than that of the fiber whereby, in use, uncoated fiber enters the fluid within the passage and coated fiber exits the fluid at the fiber exit aperture; the improvement comprising said fluid having a free surface in the storage chamber and the passage, and the valve member being vertically reciprocable relative to the cup whereby to change the size of the annular inlet aperture and so function as a regulating valve for coating fluid passing from the storage chamber to the coating chamber.
Claim 3
Dependent Claim
26 words
Apparatus as claimed in claim 1 the cup having a nipple in a base thereof, the coating chamber defined by an inside surface of the nipple.
Claim 4
Dependent Claim
13 words
Apparatus as claimed in claim 2 in which the coating chamber is conical.
Claim 5
Dependent Claim
44 words
Apparatus as claimed in claim 1 in which the valve member has a stem and the cup has a lid with above therein wherein the stem screw engages the bore to permit screw controlled vertical movement of the valve member relative to the cup.
Claim 6
Dependent Claim
32 words
Apparatus as claimed in claim 1 in which the cup has an inner wall which is steep at the top end thereof and becomes progressively more horizontally oriented near the annular aperture.
Claim 7
Dependent Claim
31 words
Apparatus as claimed in claim 1 further comprising means for supplying coating fluid to the cup to a predetermined level whereby to set a desired pressure head at the annular aperture.
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |