Patent US3885960A successfully refreshed from Google Patents.
Patent US3534286A successfully refreshed from Google Patents.
US3534286A
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US
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Microwave attenuator comprising aluminum oxide and aluminum titanate usable in a microwave tube
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1967-05-16
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Granted: 1970-10-13
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Expires: 1987-05-16
Abstract
No abstract record available.
Inventors
- 👤 Robert L Holm
- 👤 Robert F Bracken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:00
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/30; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/46; C04B35/462; C04B35/465; C04B35/478
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2252981A
Cited
US2520376A
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US2533140A
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US2837720A
Cited
US2905919A
Cited
US3169211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |