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Patent US3397447A successfully refreshed from Google Patents.
US3397447A
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US
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Method of making semiconductor circuits
Assignee: Dow Silicones Corp
•
Filing: 1964-10-22
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Granted: 1968-08-20
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Expires: 1984-10-22
Abstract
No abstract record available.
Inventors
- 👤 Cedric G Currin
- 👤 John S Hood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:22
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/40; H10D; H10D99/00; H10P; H10P10/00; H10P10/12; Y; Y10; Y10S; Y10S148/00; Y10S148/085; Y10S148/148; Y10S148/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2978804A
Cited
US3138744A
Cited
US3152939A
Cited
US3158788A
Cited
US3264712A
Cited
US3258898A
Cited
US3290753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |