Patent US2851400A successfully refreshed from Google Patents.
Patent US2699532A successfully refreshed from Google Patents.
US2699532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer or choke coil of the core type having an air-gap
Assignee: Hartford National Bank and Trust Co
•
Filing: 1950-12-07
•
Granted: 1955-01-11
•
Expires: 1970-12-07
Abstract
No abstract record available.
Inventors
- 👤 Bussing Wilhelmus Ant Gerardus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:08
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/245
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |