US3504093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction furnace apparatus for the manufacture of metal carbide
Assignee: U S VANADIUM Corp A CORP OF DE
•
Filing: 1968-11-01
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Granted: 1970-03-31
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Expires: 1988-11-01
Abstract
No abstract record available.
Inventors
- 👤 John A Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:52
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/06; C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2768277A
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US1859680A
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US2647826A
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US2673228A
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US2671123A
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US2814560A
Cited
US2840458A
Cited
US2876094A
Cited
US3295559A
Cited
US3213177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |