Patent US4347073A successfully refreshed from Google Patents.
US4347073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing glass from agglomerates which include organic coated scrap glass
Assignee: Owens Corning Fiberglas Technology Inc
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Filing: 1981-03-12
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Granted: 1982-08-31
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Expires: 2001-03-12
Abstract
Abstract A process is provided for employing scrap glass (cullet) having an organic coating thereon in an overall process wherein molten-glass forming ingredients are converted into agglomerates and the agglomerates preheated to an elevated temperature prior to melting in a glass melting furnace. The organic coating is pyrolized, i.e., thermally decarbonized, during the preheating of the agglomerates.
Inventors
- 👤 Patrick F. Aubourg
- 👤 Mark A. Propster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:17
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/02; C03C1/024
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
In a process comprising converting molten-glass forming ingredients and water into agglomerates, heating a vertical bed of gravitationally downwardly moving agglomerates in a chamber by direct contact with a gaseous heating medium so as to produce dry, heated non-aggregated agglomerates, melting said agglomerates in a glass melting furnace, the improvement wherein a portion of said molten-glass forming ingredients includes glass cullet having an organic coating thereon and pyrolizing said coating during said heating step.
Claim 2
Dependent Claim
74 words
In a process comprising converting molten-glass forming ingredients and water into agglomerates, heating a vertical bed of gravitationally downwardly moving agglomerates in a chamber by direct contact with a gaseous heating medium so as to produce dry, heated non-aggregated agglomerates, melting said agglomerates in a glass melting furnace, the improvement wherein a portion of said molten-glass forming ingredients includes glass cullet having an organic coating thereon and pyrolizing said coating during said heating step.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein said gaseous heating medium has a free oxygen content of at least about 3% by volume.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein said gaseous heating medium has a free oxygen content of at least about 5%.
Claim 5
Dependent Claim
16 words
The process of claim 2 wherein said cullet comprises glass fibers having an organic size thereon.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein said fibers have lengths of less than about one-half inch.
Claim 7
Dependent Claim
23 words
The process of claim 2 wherein said furnace is a combustion fired furnace and said gaseous medium comprises flue gases from said furnace.
Claim 8
Dependent Claim
23 words
The process of claim 2 wherein the average retention time of said gravitationally downwardly moving agglomerates is in excess of about two hours.
Claim 9
Dependent Claim
15 words
The process of claim 7 wherein said retention time is at least about six hours.
Claim 10
Dependent Claim
17 words
The process of claim 5 wherein said fibers have a length of less than about one-quarter inch.
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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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |