US3055959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical device for induction furnaces
Assignee: National Research Corp
•
Filing: 1959-11-24
•
Granted: 1962-09-25
•
Expires: 1979-11-24
Abstract
No abstract record available.
Inventors
- 👤 John T Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:51
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/20; H; H02; H02B; H02B13/00; H02B13/02; H02B13/035; H02B13/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1948704A
Cited
US2821679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |