Patent US4438210A successfully refreshed from Google Patents.
US4438210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent colorless glass-ceramics especially suitable for use as stove windows
Assignee: Corning Glass Works
•
Filing: 1982-12-20
•
Granted: 1984-03-20
•
Expires: 2002-12-20
Abstract
Abstract This invention is directed to transparent, essentially colorless glass-ceramic articles containing β-quartz solid solution as the predominant crystal phase consisting essentially, expressed in terms of weight percent on the oxide basis, of SiO 2 --65-75, Li 2 O--1-4, Al 2 O 3 --15-25, ZnO--0.5-2, Na 2 O and/or K 2 O--0-2, TiO 2 --2-6, ZrO 2 --0-2, BaO--0--0-2.5, F--0-1.2, Fe 2 O 3 -->0.01-<0.1, Through ion exchange reactions the article can be made highly resistant to attack by the atmospheres in coal and wood burning stoves.
Inventors
- 👤 Hermann L. Rittler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:19
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/002; C03C10/00; C03C10/0018; C03C10/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A transparent, essentially colorless glass-ceramic article containing β-quartz solid solution as the predominant crystal plane having a composition wherein MgO is essentially absent and consisting essentially, expressed in terms of weight percent on the oxide basis, of SiO 2 --65-75, Li 2 O--1-4, Al 2 O 3 --15-25, ZnO--0.5-2, Na 2 O and/or K 2 O--0-2, TiO 2 --2-6, ZrO 2 --0-2, BaO--0-2.5, F--0-1.2, Fe 2 O 3 -->0.01-<0.1.
Claim 2
Dependent Claim
69 words
A transparent, essentially colorless glass-ceramic article containing β-quartz solid solution as the predominant crystal plane having a composition wherein MgO is essentially absent and consisting essentially, expressed in terms of weight percent on the oxide basis, of SiO 2 --65-75, Li 2 O--1-4, Al 2 O 3 --15-25, ZnO--0.5-2, Na 2 O and/or K 2 O--0-2, TiO 2 --2-6, ZrO 2 --0-2, BaO--0-2.5, F--0-1.2, Fe 2 O 3 -->0.01-<0.1.
References Cited (Backward Citations)
US3148994A
Cited
US3970463A
Cited
US3977886A
Cited
US3856497A
Cited
US3834981A
Cited
US4057434A
Cited
US4018612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |