US3557575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming a basaltic glass-ceramic product
Assignee: Corning Glass Works
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Filing: 1969-02-04
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Granted: 1971-01-26
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Expires: 1989-02-04
Abstract
Abstract THIS INVENTION RELATES TO THE MANUFACTURE OF GLASSCERAMIC ARTICLES, WHEREIN MAGNETITE CRYSTALS ALONE OR IN COMBINATION WITH CLINOPYROXENE CRYSTALS CONSTITUTE SUBSTANTIALLY ALL OF THE CRYSTALS PRESENT, BY MELTING NATURALLYOCCURRING BASALTS UNDER OXIDIZING CONDITIONS, COOLING THE MOLTEN BASALT TO A GLASS, AND THEN HEAT TREATING THE GLASS UNDER NON-REDUCING CONDITIONS TO C RYSTALLIZE IN SITU UNIFORMLY FINE-GRAINED CRYSTALS OF MAGNETITE WITH OR WITHOUT CLINOPYROXENE HOMOGENEOUSLY DISPERSED IN A GLASSY MATRIX.
Inventors
- 👤 George H Beall
- 👤 Hermann L Rittler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:25
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |