Patent US2930938A successfully refreshed from Google Patents.
US2930938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase failure protective device
Assignee: Individual
•
Filing: 1957-05-09
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Granted: 1960-03-29
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Expires: 1977-05-09
Abstract
No abstract record available.
Inventors
- 👤 Carl L Tapper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:27
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/12; H02H3/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |