US2666904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave frequency meter
Assignee: POLYTECHNIC RES AND DEV COMPAN
•
Filing: 1948-05-28
•
Granted: 1954-01-19
•
Expires: 1968-05-28
Abstract
No abstract record available.
Inventors
- 👤 Stanley A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:34
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; G01R23/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US849166A
Cited
US1932498A
Cited
US2106768A
Cited
US2436640A
Cited
US2503256A
Cited
US2466439A
Cited
US2466765A
Cited
US2475778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |