US2870439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave energy attenuating wall
Assignee: Western Union Telegraph Co
•
Filing: 1950-12-29
•
Granted: 1959-01-20
•
Expires: 1970-12-29
Abstract
No abstract record available.
Inventors
- 👤 Harold E Stinehelfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:17
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2594971A
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US2507746A
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US2599944A
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US2464006A
Cited
US2441615A
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US2656535A
Cited
US2610250A
Cited
US2579324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |