Patent US2927255A successfully refreshed from Google Patents.
US2927255A
Expired / Lapsed
US
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Electrostatic controls
Assignee: ERDCO Inc
•
Filing: 1954-07-02
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Granted: 1960-03-01
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Expires: 1974-07-02
Abstract
No abstract record available.
Inventors
- 👤 John W Diesel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:44
CPC Classifications
H; H01; H01H; H01H59/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2066211A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |