US2687476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for and method of frequency conversion
Assignee: RADIO PATENTS Co
•
Filing: 1949-04-28
•
Granted: 1954-08-24
•
Expires: 1969-04-28
Abstract
No abstract record available.
Inventors
- 👤 Guanella Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:16
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155; H04B7/15528; H04B7/15542
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2180816A
Cited
US2405765A
Cited
US2406932A
Cited
US2452048A
Cited
US2421727A
Cited
US2505043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |