US2222784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection circuit
Assignee: Telefunken AG
•
Filing: 1938-03-02
•
Granted: 1940-11-26
•
Expires: 1958-03-02
Abstract
No abstract record available.
Inventors
- 👤 Schierl Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/548; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1607; H04B1/1623
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) | 1943-11-26 | 1944-05-27 | 1944-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-26 | 1948-05-27 | 1948-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-26 | 1952-05-27 | 1952-11-26 | $7700.00 | Window Closed / Lapsed |