Patent US3867119A successfully refreshed from Google Patents.
US3867119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for manufacturing glass fibers
Assignee: Paramount Glass Manufacturing Co Ltd
•
Filing: 1973-09-25
•
Granted: 1975-02-18
•
Expires: 1993-09-25
Abstract
Abstract Glass filaments with a narrow range of diameters for use in method of glass fiber production are prepared by discharging the molten glass under gravity flow through a novel multi-orifice bushing plate having a first, or inner, bushing plate adapted to support a charge of molten glass and provided with a plurality of tubular discharge orifices extending downwardly therefrom, and a second or outer, bushing plate spaced from said first plate approximately at the outlet tips of the discharge orifices, said outer plate being electrically conductive and adapted to be heated by the controlled flow of electricity therethrough to regulate the temperature of glass streams discharging through the orifices and a third plate located between and parallel to the inner and outer plates in heat conductive relation to the tubes extending therethrough. If desired, water-cooled heat-absorbing fins may be provided at selected locations on the outer bushing for further control of the temperature of the glass streams.
Inventors
- 👤 Kesaharu Kasuga
- 👤 Takeo Abe
- 👤 Tsunehiro Haga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:16
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/06; C03B37/065; C03B37/08; C03B37/083; C03B37/09; C03B37/091
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
Apparatus for manufacturing glass filaments comprising means for holding a body of molten glass to be formed into said filaments, said means having an inner rectangularly-shaped bushing plate for supporting said body, a plurality of tubes extending below said inner plate each communicating with said holding means through an orifice in said inner plate whereby molten glass may flow out of said holding means, an outer rectangularly-shaped bushing plate spaced from said innder bushing plate spaced from said inner bushing plate, the space between said outer bushing plate and said inner bushing plate being filled with air and enclosed, said outer bushing plate being provided with a plurality of equally spaced apertures corresponding in number and arrangement to the said orifices also equally spaced, to receive the lower ends of said tubes, said lower ends being disposed without extending downward below said outer bushing plate, said outer plate being made of electricallyconductive material providing electrical resistive heating zones therein, and means for supplying an electric current to said outer plate and a third plate located between and parallel to the inner and outer plates in heat conductive relation to the tubes extending therethrough.
Claim 2
Dependent Claim
193 words
Apparatus for manufacturing glass filaments comprising means for holding a body of molten glass to be formed into said filaments, said means having an inner rectangularly-shaped bushing plate for supporting said body, a plurality of tubes extending below said inner plate each communicating with said holding means through an orifice in said inner plate whereby molten glass may flow out of said holding means, an outer rectangularly-shaped bushing plate spaced from said innder bushing plate spaced from said inner bushing plate, the space between said outer bushing plate and said inner bushing plate being filled with air and enclosed, said outer bushing plate being provided with a plurality of equally spaced apertures corresponding in number and arrangement to the said orifices also equally spaced, to receive the lower ends of said tubes, said lower ends being disposed without extending downward below said outer bushing plate, said outer plate being made of electricallyconductive material providing electrical resistive heating zones therein, and means for supplying an electric current to said outer plate and a third plate located between and parallel to the inner and outer plates in heat conductive relation to the tubes extending therethrough.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1 in which means for cooling molten glass flowing from at least some of the tubes are provided below the bottom plate.
Claim 4
Dependent Claim
14 words
Apparatus according to claim 2 in which the cooling means include a liquid coolant.
Claim 5
Dependent Claim
15 words
Apparatus according to claim 1 in which the heating zones are provided with separate controls.
Claim 6
Dependent Claim
34 words
Apparatus according to claim 1 in which portions of the outer plate extend outwardly of the glass holding means and are bent downwardly to deflect air currents around the lower ends of the tubes.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |