Patent US2784831A successfully refreshed from Google Patents.
US2784831A
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US
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Automatic inverter
Assignee: JB Ehrsam and Sons Manufacturing Co
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Filing: 1954-02-16
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Granted: 1957-03-12
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Expires: 1974-02-16
Abstract
No abstract record available.
Inventors
- 👤 Willard B Connell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:46
CPC Classifications
B; B65; B65G; B65G47/00; B65G47/22; B65G47/24; B65G47/248; B28; B28B; B28B13/00; B28B13/04; B28B13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US912764A
Cited
US1053632A
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US1039202A
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US2029456A
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US1901928A
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US1970749A
Cited
US2641371A
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US2664992A
Cited
US2762487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |