US2539673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency measuring system
Assignee: RCA Corp
•
Filing: 1944-04-20
•
Granted: 1951-01-30
•
Expires: 1964-04-20
Abstract
No abstract record available.
Inventors
- 👤 Harold O Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:03
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; G01R23/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB355705A
Cited
US1982340A
Cited
US1966230A
Cited
US2019503A
Cited
US2186182A
Cited
US2321315A
Cited
US2380288A
Cited
US2405597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |