US2598671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency distinguishing device
Assignee: Individual
•
Filing: 1945-10-16
•
Granted: 1952-06-03
•
Expires: 1965-10-16
Abstract
No abstract record available.
Inventors
- 👤 Lawrence W Boothby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:35
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2106713A
Cited
US2245138A
Cited
US2189549A
Cited
US2373233A
Cited
US2526678A
Cited
US2408420A
Cited
US2499777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |