Patent US3521284A successfully refreshed from Google Patents.
US3521284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna with pattern directivity control
Assignee: JOHN PAUL SHELTON JR
•
Filing: 1968-01-12
•
Granted: 1970-07-21
•
Expires: 1988-01-12
Abstract
No abstract record available.
Inventors
- 👤 John Paul Shelton Jr
- 👤 Leland D Strom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:34
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/29; H01Q25/00; H01Q7/00; H01Q9/00; H01Q9/04; H01Q9/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2644888A
Cited
US3396398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |