US3580710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particle tube fusion furnace
Assignee: GTE Sylvania Inc
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Filing: 1968-11-15
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Granted: 1971-05-25
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Expires: 1988-11-15
Abstract
Abstract EQUIPMENT FOR THE MANUFACTURE OF QUARTZ BODIES WHICH ARE FREE OF AIR POCKETS INCLUDING A VACUUM SYSTEM ASSOCIATED WITH A HOLDER FOR QUARTZ TUBING. THE END OF QUARTZ TUBING IS DISPOSED WITHIN A FURNACE FOR SOFTENING. WHEN SOFT, THE QUARTZ IS CUT OFF AND A BODY OF AIR-FREE QUARTZ IS FORMED.
Inventors
- 👤 Richard G Britt
- 👤 Frederick A Loughridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:58
CPC Classifications
C; C03; C03B; C03B19/00
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |