Patent US2515221A successfully refreshed from Google Patents.
US2515221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray phase measuring device
Assignee: Individual
•
Filing: 1948-01-22
•
Granted: 1950-07-18
•
Expires: 1968-01-22
Abstract
No abstract record available.
Inventors
- 👤 Eugene S Henning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:26
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/24; G01P5/245; G01P5/248; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1768262A
Cited
US2015933A
Cited
US2193079A
Cited
US2251984A
Cited
US2274262A
Cited
US2328546A
Cited
US2446674A
Cited
US2465354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |