US3021521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feed-through nulling systems
Assignee: Raytheon Co
•
Filing: 1955-11-30
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Granted: 1962-02-13
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Expires: 1975-11-30
Abstract
No abstract record available.
Inventors
- 👤 William R Hutchins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:29
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/03; G01S7/038
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2253958A
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US2551348A
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US2583573A
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US2760057A
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US2745069A
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US2748353A
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US2866192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |