US2844801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pass filter units for high frequency signal circuits
Assignee: BARKER AND WILLIAMSON Inc
•
Filing: 1953-12-30
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Granted: 1958-07-22
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Expires: 1973-12-30
Abstract
No abstract record available.
Inventors
- 👤 Sabaroff Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:38
CPC Classifications
H; H03; H03H; H03H1/00; H03H7/00; H03H7/01; H03H7/0115; H03H7/17; H03H7/1741; H03H7/1758
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1978098A
Cited
US2014521A
Cited
US2163775A
Cited
US2221105A
Cited
US2346162A
Cited
US2589076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |