US2641755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short-wave directional radio communication system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1950-11-22
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Granted: 1953-06-09
•
Expires: 1970-11-22
Abstract
No abstract record available.
Inventors
- 👤 Everhard H B Bartelink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:01
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155; H04B7/15528; H04B7/1555
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2063534A
Cited
US2152329A
Cited
US2257319A
Cited
US2234244A
Cited
US2550700A
Cited
US2401759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |