US3467889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical measuring systems
Assignee: English Electric Co Ltd
•
Filing: 1966-12-13
•
Granted: 1969-09-16
•
Expires: 1986-12-13
Abstract
No abstract record available.
Inventors
- 👤 Keith Begbie Brough-Cunningham
- 👤 Leonard George Wardle
- 👤 Michael Cullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:58
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2946044A
Cited
US2879454A
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US3030614A
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US3114900A
Cited
US3144585A
Cited
US3273017A
Cited
US3312866A
Cited
US3293605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-15 | 1973-03-17 | 1973-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-15 | 1977-03-17 | 1977-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-15 | 1981-03-17 | 1981-09-16 | $7700.00 | Window Closed / Lapsed |