US3303420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instantaneous frequency resolver
Assignee: Individual
•
Filing: 1947-12-09
•
Granted: 1967-02-07
•
Expires: 1967-12-09
Abstract
No abstract record available.
Inventors
- 👤 Harris Frederick
- 👤 Mack J Sheets
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:23
CPC Classifications
G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2130485A
Cited
US2189300A
Cited
US2434914A
Cited
US2366628A
Cited
US2434945A
Cited
US2457136A
Cited
US2470731A
Cited
US2541067A
Cited
US2528187A
Cited
US2481247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |