Patent US3447958A successfully refreshed from Google Patents.
US3447958A
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US
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Surface treatment for semiconductor devices
Assignee: Hitachi Ltd
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Filing: 1965-03-03
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Granted: 1969-06-03
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Expires: 1985-03-03
Abstract
No abstract record available.
Inventors
- 👤 Shinkichi Okutsu
- 👤 Noriyuki Nariai
- 👤 Takeshi Takagi
- 👤 Keijiro Uehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:56
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/66; H10P14/662; C; C23; C23D; C23D5/00; H01; H01B; H01B3/00; H01B3/02; H01B3/025; H01B3/08; H01B3/088; H01B3/10; H10P14/63; H10P14/6302; H10P14/6304; H10P14/6314; H10P14/6322; H10P14/69; H10P14/692; H10P14/6921; H10P14/6928; H10P14/6938; H10P14/6939; H10W; H10W74/00; H10W74/10; H10W74/131; H10P14/69215; H10P14/6922; H10P14/6923; Y; Y10; Y10S; Y10S148/00; Y10S148/043; Y10S148/145; Y10S438/00; Y10S438/958
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) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |