US2755421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for proportional electric control
Assignee: Hartford National Bank and Trust Co
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Filing: 1951-05-04
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Granted: 1956-07-17
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Expires: 1971-05-04
Abstract
No abstract record available.
Inventors
- 👤 Roosdorp Hermanus Joannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:03
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/36; G05D; G05D23/00; G05D23/19; G05D23/1919; G05D23/20; G05D23/22
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) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |