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US3531708A
Expired / Lapsed
US
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Integral structure three-phase ferroresonant transformer
Assignee: ITT Inc
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Filing: 1968-10-07
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Granted: 1970-09-29
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Expires: 1988-10-07
Abstract
No abstract record available.
Inventors
- 👤 Richard E Kuba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:54
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/04; G05F3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1614161A
Cited
US1342995A
Cited
CH106314A
Cited
US2497499A
Cited
GB760935A
Cited
CH355210A
Cited
US3129383A
Cited
US3427527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |