US3754881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Art of producing inorganic bodies having at least a surface layer which is semicrystalline
Assignee: OI Glass Inc
•
Filing: 1969-03-27
•
Granted: 1973-08-28
•
Expires: 1989-03-27
Abstract
Abstract This patent pertains to a method for producing a crystalized glass article in which a glass containing 50.8 percent SiO2, 8.2 percent Al2O3, 22.5 percent Zno and 18.5 percent CaO is roughened on an exposed surface such that it has a frosted appearance and thereafter is crystalized on the surface by controlled heating, below the softening temperature to initiate and obtain, crystalization.
Inventors
- 👤 R Petticrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:32
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0009; C03C4/00; C03C4/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |