US2848675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction machines
Assignee: National Research Development Corp UK
•
Filing: 1956-11-29
•
Granted: 1958-08-19
•
Expires: 1976-11-29
Abstract
No abstract record available.
Inventors
- 👤 Frederic C Williams
- 👤 Eric R Laithwaite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:04
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1559920A
Cited
US1514474A
Cited
US1595550A
Cited
US1770775A
Cited
US2047831A
Cited
US2372590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |