US3628930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for preparing molten material into glass fibers
Assignee: Johns Manville Corp
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Filing: 1969-10-28
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Granted: 1971-12-21
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Expires: 1989-10-28
Abstract
Abstract A bushing for rendering materials molten used for forming glass fibers wherein the flow pattern of material within the bushing is controlled. An internal baffel has an array of perforations in a pattern such that, when the material on one side of the baffel is cooler than that on the other side, the percentage of open area is greater in the flow path to those regions of the bushing of highest temperature than the path to those regions of lower temperature.
Inventors
- 👤 Walter William Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:56
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/08; C03B37/083; C03B37/081; D; D01; D01D; D01D1/00; D01D1/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
The method according to claim 1 wherein the supplying region is above the exudation region, wherein the molten material in the supplying region is cooler than the molten material in the exudation region, wherein the pattern of zones is generally horizontal, and wherein material is directed downward from the supplying region above the hotter zones into the exudation region of the hotter zones at a faster rate than material is directed downward from the supplying region above the cooler zones.
Claim 2
Dependent Claim
12 words
The method according to claim 2 wherein the molten material is glass.
Claim 3
Dependent Claim
133 words
An electrical resistance type metal bushing for supplying molten material in the form of exudations to be attenuated into filaments, wherein said bushing comprises side, end and bottom walls said bottom wall having a plurality of orifices for exuding the molten material and wherein said bottom wall tends to develop zones of temperatures adjacent certain of orifices greater than the temperatures adjacent other orifices, the improvement comprising: a baffle separating an upper portion of the bushing interior from a lower portion thereof, said baffle having at least two areas having different percentages of open area in an array providing a greater percentage of open area above the zones of greater temperature than above said other areas of said bottom wall for the passage of molten material from said upper to said lower portion.
Claim 4
Dependent Claim
17 words
A bushing according to claim 4 wherein said open areas are patterns of apertures of different size.
Claim 5
Dependent Claim
33 words
A bushing according to claim 5 wherein solid increments are introduced into said upper portion and wherein said apertures are of a size to prevent passage of said increments to said lower portion.
Claim 6
Dependent Claim
50 words
A bushing according to claim 4 wherein each end of said bushing has a zone which is hotter than the zone intermediate the ends; and wherein said baffle has an array of relatively large apertures above each end zone, and an array of relatively small apertures above the intermediate zone.
Claim 7
Dependent Claim
27 words
A bushing according to claim 7 wherein the large apertures extend across the width of the bushing and along about one-fifth of its length on each end.
Claim 8
Dependent Claim
79 words
A bushing according to claim 4 wherein said bushing has a zone at each end which tends to be hotter than the zone intermediate said end zones and wherein said end zones of said baffle have about 3.1 percent open arEa while said intermediate zone of said baffle has about 24 percent open area. 10 A bushing according to claim 8 wherein said large apertures are about 0.09 inch diameter and said small apertures are about 0.05 inch diameter
Claim 9
Dependent Claim
46 words
A bushing according to claim 10 wherein the total area of said large apertures in said end zones is about 31 percent of the zone area and the total area of said small apertures in said intermediate zone is about 24 percent of the zone area.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |