US3469173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spike noise elimination circuit for a d.c.-a.c. converter
Assignee: Hitachi Ltd
•
Filing: 1966-12-02
•
Granted: 1969-09-23
•
Expires: 1986-12-02
Abstract
No abstract record available.
Inventors
- 👤 Shin-Ichi Ohashi
- 👤 Toshijiro Takagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:40
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H03; H03F; H03F3/00; H03F3/38; H03F3/387; H03F3/393
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3237116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |