US2849674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency multiplying transformer
Assignee: General Engineering Co Ltd
•
Filing: 1955-05-02
•
Granted: 1958-08-26
•
Expires: 1975-05-02
Abstract
No abstract record available.
Inventors
- 👤 Biringer Paul Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:28
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/02; H01F38/04; H01F29/00; H01F29/14; H01F29/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1157730A
Cited
US1592901A
Cited
US1787948A
Cited
DE671469C
Cited
US2395389A
Cited
US2666178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |