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US3479237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etch masks on semiconductor surfaces
Assignee: AT&T Inc
•
Filing: 1966-04-08
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Granted: 1969-11-18
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Expires: 1986-04-08
Abstract
No abstract record available.
Inventors
- 👤 Arpad A Bergh
- 👤 Willem Van Gelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:25
CPC Classifications
H; H10; H10P; H10P95/00; C; C23; C23F; C23F1/00; H10W; H10W74/00; H10W74/40; Y; Y10; Y10S; Y10S148/00; Y10S148/043; Y10S148/106; Y10S148/113; Y10S148/114
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3406043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |