US2570013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency discriminator
Assignee: Hartford National Bank and Trust Co
•
Filing: 1949-06-17
•
Granted: 1951-10-02
•
Expires: 1969-06-17
Abstract
No abstract record available.
Inventors
- 👤 Bonifacius Johannes Hardenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:58
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/12; H04N5/126; G; G01; G01R; G01R23/00; G01R23/005; H03; H03D; H03D3/00; H03L; H03L7/00; H03L7/06; H03L7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2335265A
Cited
US2391776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |