US3445280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of semiconductor device
Assignee: Hitachi Ltd
•
Filing: 1965-08-09
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Granted: 1969-05-20
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Expires: 1985-08-09
Abstract
No abstract record available.
Inventors
- 👤 Takashi Tokuyama
- 👤 Keijiro Uehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:20
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/69; H10P14/692; H10P14/6921; H10P14/69215; C; C23; C23C; C23C16/00; C23C16/02; C23C16/0272; C23C16/22; C23C16/30; C23C16/40; C23C16/401; C23C16/402; H10P14/63; H10P14/6326; H10P14/6328; H10P14/6334; H10P14/6336; H10P14/66; H10P14/668; H10P14/6681; H10P14/6682; H10P14/6922; Y; Y10; Y10S; Y10S148/00; Y10S148/043; Y10S148/049; Y10S148/118
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3242007A
Cited
US3158505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |