US3662387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite radar absorbing material
Assignee: United States Department of the Air Force
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Filing: 1966-10-29
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Granted: 1972-05-09
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Expires: 1986-10-29
Abstract
Abstract A means for minimizing the reflections of electromagnetic radiations from metal surfaces in which the reflective metal surfaces is provided with a thin layer of a lithium-cadmiumferrite material. The ferrite material acts as a protective shield by absorbing incident microwave radiations which are normally reflected from metal surfaces.
Inventors
- 👤 Dale M Grimes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:30
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/004; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2691
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2856365A
Cited
US3185986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |