Patent FR713869A successfully refreshed from Google Patents.
US2897461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave guide construction
Assignee: Boeing Co
•
Filing: 1953-09-14
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Granted: 1959-07-28
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Expires: 1973-09-14
Abstract
No abstract record available.
Inventors
- 👤 Ashbaugh Fred Edmund
- 👤 Paul B Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:36
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/12; H01P3/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2411534A
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GB584153A
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US2761137A
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US2596251A
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FR976767A
Cited
US2696834A
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US2704830A
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US2629066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |