US3597180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating layer for bushing supporting system
Assignee: Owens Corning
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Filing: 1968-08-14
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Granted: 1971-08-03
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Expires: 1988-08-14
Abstract
Abstract A PLATINUM BRUSHING FROM WHICH FIBERS ARE ATTENUATED IS SUPPORTED BY A CAST CERAMIC BODY WITH AN INSULATING LAYER THEREBETWEEN. THE INSULATING LAYER CONSISTS ESSENTIALLY OF HIGHLY REFRACTORY FIBERS OF SILICA AND ALUMINA TO WHICH ADDITIONAL ALUMINA IS SUPPLIED SO THAT WHEN THE BUSHING IS HEATED TO AN ELEVATED TEMPERATURE, IN EXCESS OF 2800*F., THE FIBROUS INSULATING LAYER TRANSFORMS TO MULLITE AND IS FREE OF ANY GLASS. SUCH AN INSULATING LAYER HAS A MUCH LONGER LIFE THAN THOSE HERETOFORE EMPLOYED AND DOES NOT REACT WITH THE CAST CERAMIC SUPPORTING BODY AS HAS HERETOFORE OCCURED.
Inventors
- 👤 Thomas D Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:15
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/08; C03B37/081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |