US2810858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective circuit
Assignee: TDK Micronas GmbH
•
Filing: 1954-06-14
•
Granted: 1957-10-22
•
Expires: 1974-06-14
Abstract
No abstract record available.
Inventors
- 👤 Stein Emanuel
- 👤 Fred H Numrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:48
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2131203A
Cited
US2098384A
Cited
US2222426A
Cited
US2261645A
Cited
US2635208A
Cited
US2476167A
Cited
US2709768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |