US4309204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for remelting scrap glass
Assignee: Owens Corning Fiberglas Technology Inc
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Filing: 1979-11-19
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Granted: 1982-01-05
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Expires: 1999-11-19
Abstract
Abstract A process and apparatus for remelting scrap glass fibers is disclosed. The removal of binder and remelting of the scrap are carried out in one operation, and the resulting molten scrap fibers are fed directly into a conventional glass melting furnace. Granular raw glass batch also is fed into the glass melting furnace.
Inventors
- 👤 Robert Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:14
CPC Classifications
C; C03; C03B; C03B3/00; C03B3/02; Y; Y02; Y02P; Y02P40/00; Y02P40/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
A process for recycling scrap glass including the steps of: feeding scrap glass to a scrap glass melting furnace; maintaining oxidizing conditions within the scrap furnace so as to burn-off organic binders or sizes; converting the scrap glass to a molten glass; and feeding the molten glass to a glass melting furnace which is also being fed granular raw glass batch, including the step of maintaining a temperature gradient between the top and bottom of the scrap furnace wherein the top of the scrap melter is up to 600° F. cooler than the bottom.
Claim 2
Dependent Claim
94 words
A process for recycling scrap glass including the steps of: feeding scrap glass to a scrap glass melting furnace; maintaining oxidizing conditions within the scrap furnace so as to burn-off organic binders or sizes; converting the scrap glass to a molten glass; and feeding the molten glass to a glass melting furnace which is also being fed granular raw glass batch, including the step of maintaining a temperature gradient between the top and bottom of the scrap furnace wherein the top of the scrap melter is up to 600° F. cooler than the bottom.
Claim 3
Dependent Claim
17 words
A process according to claim 1 where the granular raw glass batch is fed in agglomerated form.
Claim 4
Dependent Claim
29 words
A process according to claim 1 wherein the molten scrap glass is 5 to 50% by weight of the total glass batch being fed to the glass melting furnace.
Claim 5
Dependent Claim
19 words
A process according to claim 3 wherein percent by weight of molten scrap glass ranges from 5 to 25.
Claim 6
Dependent Claim
65 words
A process according to claim 1 wherein the scrap glass is fed into the top of the scrap melter in the form of scrap glass fibers; wherein the temperature pyrolizes any organic binder or size but does not melt the scrap glass; melting the scrap glass in the lower portion of the scrap melter; and removing molten glass from the bottom of the scrap melter.
Claim 7
Dependent Claim
53 words
A process according to claim 1 or 5 including the steps of: melting and refining the glass batch including the molten scrap glass in the glass melting furnace; and transferring the molten glass to a fiberizing device and converting the molten glass into glass fibers by attenuating glass streams leaving the fiberizing device.
Claim 8
Dependent Claim
85 words
A process for recycling scrap glass including the steps of: feeding scrap glass to a scrap glass melting furnace; maintaining oxidizing conditions within the scrap furnace so as to burn-off organic binders or sizes; converting the scrap glass to a molten glass; and feeding the molten glass to a glass melting furnace which is also being fed granular raw glass batch, wherein the top of the scrap melter is maintained at 2200° F. and the bottom at 2500° F., thereby maintaining a temperature gradient therebetween.
Claim 9
Dependent Claim
85 words
A process for recycling scrap glass including the steps of: feeding scrap glass to a scrap glass melting furnace; maintaining oxidizing conditions within the scrap furnace so as to burn-off organic binders or sizes; converting the scrap glass to a molten glass; and feeding the molten glass to a glass melting furnace which is also being fed granular raw glass batch, wherein the top of the scrap melter is maintained at 2200° F. and the bottom at 2500° F., thereby maintaining a temperature gradient therebetween.
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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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |