US2955254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic commutator
Assignee: International Business Machines Corp
•
Filing: 1957-10-04
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Granted: 1960-10-04
•
Expires: 1977-10-04
Abstract
No abstract record available.
Inventors
- 👤 Leo M Audretsch
- 👤 Jr Kelly B Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:50
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/64; H03K3/72; H03K5/00; H03K5/15; H03K5/15013; H03K5/1506; H03K5/15093
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) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |