US3421936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon nitride coating on semiconductor and method
Assignee: Sprague Electric Co
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Filing: 1964-12-21
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Granted: 1969-01-14
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Expires: 1984-12-21
Abstract
No abstract record available.
Inventors
- 👤 Ferdinand Lincoln Vogel Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:01
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/69; H10P14/694; H10P14/6943; H10P14/69433; H10P14/63; H10P14/6326; H10P14/6328; H10P14/6334; Y; Y10; Y10S; Y10S148/00; Y10S148/043; Y10S148/114; Y10S148/15
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) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |