US3514694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for ground fault detection,metering and control of alternating current electrical systems
Assignee: Individual
•
Filing: 1968-01-09
•
Granted: 1970-05-26
•
Expires: 1988-01-09
Abstract
No abstract record available.
Inventors
- 👤 Robert W Beachley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:01
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/16; G01R27/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1578571A
Cited
DE515366C
Cited
GB313689A
Cited
US2154270A
Cited
US2565824A
Cited
US3253215A
Cited
US3308345A
Cited
US3356939A
Cited
US3418569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |