US4264649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating optical waveguide filaments
Assignee: Corning Glass Works
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Filing: 1979-12-26
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Granted: 1981-04-28
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Expires: 1999-12-26
Abstract
Abstract A method of coating an optical waveguide filament employing a sizing die having a tapered aperture terminating in a sizing orifice and a guide cone having a tapered outer wall terminating in a tip which is disposed adjacent said tapered aperture. The filament passes through an orifice in the tip of the guide cone and thereafter through the sizing die. The coating material flows into the channel formed between the tapered aperture and the tapered outer wall and contacts the filament in a region that is located between the guide cone tip and the sizing die orifice.
Inventors
- 👤 Stewart A. Claypoole
- 👤 Arthur J. Wixson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:36
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C03C25/12; C03C25/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
A method of coating a filament comprising the steps of providing a die holder which supports a sizing die and a guide cone in longitudinally spaced relationship, said die having a longitudinally tapered aperture, the small end of which defines a sizing orifice, said guide cone having an outer wall, the tip of which terminates at the large end of said tapered aperture, said guide cone having a longitudinal orifice therethrough terminating at said tip, the region between the tip end of said outer wall and said tapered aperture forming a channel, passing said filament through said longitudinal orifice and said tapered aperture, introducing coating material into said channel from the end thereof adjacent said guide cone so that said coating material flows over the tip of said guide cone toward said sizing orifice, and controlling the coating delivery pressure to cause said coating material to contact said filament at a region thereof between said tip and said sizing die orifice.
Claim 2
Independent Claim
161 words
A method of coating a filament comprising the steps of providing a die holder which supports a sizing die and a guide cone in longitudinally spaced relationship, said die having a longitudinally tapered aperture, the small end of which defines a sizing orifice, said guide cone having an outer wall, the tip of which terminates at the large end of said tapered aperture, said guide cone having a longitudinal orifice therethrough terminating at said tip, the region between the tip end of said outer wall and said tapered aperture forming a channel, passing said filament through said longitudinal orifice and said tapered aperture, introducing coating material into said channel from the end thereof adjacent said guide cone so that said coating material flows over the tip of said guide cone toward said sizing orifice, and controlling the coating delivery pressure to cause said coating material to contact said filament at a region thereof between said tip and said sizing die orifice.
Claim 3
Dependent Claim
58 words
The method of claim 1 wherein the step of controlling the coating delivery pressure comprises initially adjusting said coating delivery pressure to a pressure within the starvation pressure range, increasing the delivery pressure to a lower stable value at which starvation just ceases, and thereafter increasing the delivery pressure to an operating pressure above said lower stable value.
Claim 4
Dependent Claim
20 words
A method in accordance with claim 2 wherein said operating pressure is less than 1.4 times said minimum stable pressure.
Claim 5
Dependent Claim
43 words
A method in accordance with claim 3 wherein the step of adjusting the delivery pressure to a value above said lower stable value comprises adjusting the delivery pressure to a value in the range of 1.15 to 1.3 times said lower stable value.
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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |