Patent US3433471A successfully refreshed from Google Patents.
US3433471A
Expired / Lapsed
US
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Metallurgical furnace
Assignee: Saint Gobain Ceramics and Plastics Inc
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Filing: 1965-12-08
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Granted: 1969-03-18
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Expires: 1985-12-08
Abstract
No abstract record available.
Inventors
- 👤 Allen M Alper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:29
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611; C04B35/52; C04B35/528; C04B35/532; C04B35/5622; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |