US2670461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic wave attenuator
Assignee: Unisys Corp
•
Filing: 1949-09-29
•
Granted: 1954-02-23
•
Expires: 1969-09-29
Abstract
No abstract record available.
Inventors
- 👤 Vincent R Learned
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:00
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/22; H01P1/225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1996186A
Cited
US2436427A
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GB606891A
Cited
US2454530A
Cited
US2491644A
Cited
US2531777A
Cited
US2515228A
Cited
US2534437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |