US2987721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband discage antenna
Assignee: Individual
•
Filing: 1959-11-04
•
Granted: 1961-06-06
•
Expires: 1979-11-04
Abstract
No abstract record available.
Inventors
- 👤 William J E Edwards
- 👤 Sam E Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:07
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2102410A
Cited
US2158875A
Cited
US2267889A
Cited
US2393218A
Cited
US2756420A
Cited
DE935558C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |