US2967931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave meters
Assignee: Marconi Instruments Ltd
•
Filing: 1956-12-19
•
Granted: 1961-01-10
•
Expires: 1976-12-19
Abstract
No abstract record available.
Inventors
- 👤 Willis Douglas Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:35
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)
US1864543A
Cited
US1982340A
Cited
US2186182A
Cited
GB566906A
Cited
US2491494A
Cited
US2478023A
Cited
US2763836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-10 | 1964-07-11 | 1965-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-10 | 1968-07-11 | 1969-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-10 | 1972-07-11 | 1973-01-10 | $7700.00 | Window Closed / Lapsed |