US2212192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic apparatus
Assignee: Individual
•
Filing: 1938-12-08
•
Granted: 1940-08-20
•
Expires: 1958-12-08
Abstract
No abstract record available.
Inventors
- 👤 Hugh A Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:15
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K21/145; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-08-20 | 1944-02-19 | 1944-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-20 | 1948-02-19 | 1948-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-20 | 1952-02-19 | 1952-08-20 | $7700.00 | Window Closed / Lapsed |