US3763294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Firing vitreous silica articles while supported on a perforated thin walled graphite mandrel
Assignee: Corning Glass Works
•
Filing: 1971-06-28
•
Granted: 1973-10-02
•
Expires: 1991-06-28
Abstract
Abstract IMPROVEMENT IN THE STEP OF FIRING A HIGH PURITY, CLOSE TOLERANCE, VITREOUS SILICA ARTICLE CAPABLE OF BEING INSIDESUPPORTED, WHEREBY THE ARTICLE IS SUPPORTED ON ITS INNER SURFACE ONLY, IN A BOTTOM-END-UP POSITION ON A PERFORATED, THIN-WALL GRAPHITE SUPPORT HAVING AN OUTER SURFACE SUBSTANTIALLY COMPLEMENTARY IN SHAPE TO THE INNER SURFACE OF THE ARTICLE AND SINTERED IN THE PRESENCE OF AT LEAST ONE PROTECTIVE GAS ATMOSPHERE FOR A TIME SUFFICIENT TO COMPLETELY FUSE THE ARTICLE.
Inventors
- 👤 C Nicastro
- 👤 R Noordaa
- 👤 W Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:23
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/653; C03; C03B; C03B19/00; C03B19/06; C03B19/066; C03B20/00; C04B35/01; C04B35/14; Y; Y10; Y10S; Y10S65/00; Y10S65/04
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |