Patent US3140491A successfully refreshed from Google Patents.
US3140491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffraction shield consisting of notched ring which frames passive reflector
Assignee: Boeing Co
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Filing: 1963-01-24
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Granted: 1964-07-07
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Expires: 1983-01-24
Abstract
No abstract record available.
Inventors
- 👤 Fred E Ashbaugh
- 👤 Frank W Bushman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:58
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/02; H01Q19/021; H01Q19/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A MICROWAVE SYSTEM HAVING MEANS FOR CONTROLLING EDGE DIFFRACTION COMPRISING: REFLECTOR MEANS, RING MEANS EXTENDING AROUND AT LEAST A PORTION OF SAID REFLECTOR
Claim 2
Dependent Claim
23 words
A MICROWAVE SYSTEM HAVING MEANS FOR CONTROLLING EDGE DIFFRACTION COMPRISING: REFLECTOR MEANS, RING MEANS EXTENDING AROUND AT LEAST A PORTION OF SAID REFLECTOR
References Cited (Backward Citations)
US1987780A
Cited
US2460869A
Cited
GB726058A
Cited
FR1105354A
Cited
US2895127A
Cited
US2895131A
Cited
DE1020065B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |