Patent US3480833A successfully refreshed from Google Patents.
US3480833A
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Polyphase system protective relay assembly and calibrating apparatus therefor
Assignee: MAUREEN ELIZABETH GIDDEN
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Filing: 1967-08-09
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Granted: 1969-11-25
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Expires: 1987-08-09
Abstract
No abstract record available.
Inventors
- 👤 Melvin Oland Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:06
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/06; H02H3/066; H02H3/04; H02H3/044; H02H3/24; H02H3/253
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3258647A
Cited
US2441979A
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US2611009A
Cited
US2838717A
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US3056067A
Cited
US3382411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |