US3474307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device for chopper circuits having lead wires of copper metal and alloys thereof
Assignee: Hitachi Ltd
•
Filing: 1966-03-25
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Granted: 1969-10-21
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Expires: 1986-03-25
Abstract
No abstract record available.
Inventors
- 👤 Shin-Ichi Ohashi
- 👤 Toshijiro Takagi
- 👤 Zenmon Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:08
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/10; H10W76/12; H10W76/15; H10W76/153; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/693; H10W40/00; H10W40/70; H10W44/00; H10W44/20; H10W74/00; H10W74/10; H10W74/111; H10W74/121; H10W76/40; H10W76/42; H10W76/45; H10W72/00; H10W72/071; H10W72/075; H10W72/07551; H10W72/07555; H10W72/50; H10W72/531; H10W72/536; H10W72/5363; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W72/5525; H10W72/59; H10W72/90; H10W72/951; H10W72/952; H10W90/00; H10W90/701; H10W90/751; H10W90/753; H10W90/754
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2850687A
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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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |