Patent US3419666A successfully refreshed from Google Patents.
US3419666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric furnace
Assignee: Individual
•
Filing: 1967-12-29
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Granted: 1968-12-31
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Expires: 1987-12-29
Abstract
No abstract record available.
Inventors
- 👤 David W Groom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:18
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/006; F22; F22B; F22B1/00; F22B1/28; F22B1/287; F24H; F24H1/00; Y; Y10; Y10S; Y10S65/00; Y10S65/04
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) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |