US3453452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trapezoidal-waveform drive method and apparatus
Assignee: Unisys Corp
•
Filing: 1965-12-29
•
Granted: 1969-07-01
•
Expires: 1985-12-29
Abstract
No abstract record available.
Inventors
- 👤 David A Starr Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:23
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/94; G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/325
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |