US3479583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line voltage fluctuation insensitive detector for phase failures on three phase transformers
Assignee: International Business Machines Corp
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Filing: 1967-12-11
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Granted: 1969-11-18
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Expires: 1987-12-11
Abstract
No abstract record available.
Inventors
- 👤 Horst J Hemprich
- 👤 Walter F Schneider
- 👤 Hans W Spiro
- 👤 Joachim O Zehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:10
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/24; H02H3/253
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2993172A
Cited
US3184644A
Cited
US3013185A
Cited
US3160787A
Cited
US3160786A
Cited
US3248610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |