Patent US3047848A successfully refreshed from Google Patents.
US3047848A
Expired / Lapsed
US
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Safety circuit for rectifier power sources
Assignee: AO Smith Corp
•
Filing: 1957-03-25
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Granted: 1962-07-31
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Expires: 1977-03-25
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:56
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/1203; H02H7/1206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2057531A
Cited
US2141927A
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US2398366A
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US2774960A
Cited
US2813243A
Cited
US2932781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |