US3490964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming semiconductor devices by masking and diffusion
Assignee: Texas Instruments Inc
•
Filing: 1966-04-29
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Granted: 1970-01-20
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Expires: 1986-04-29
Abstract
No abstract record available.
Inventors
- 👤 Charles Alexander Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:44
CPC Classifications
H; H10; H10P; H10P32/00; C; C30; C30B; C30B31/00; C30B31/06; H10D; H10D99/00; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/017; Y10S148/04; Y10S148/041; Y10S148/043; Y10S148/049; Y10S148/144; Y10S148/173; Y10S438/00; Y10S438/914; Y10S438/92; Y10S438/934
Claims Analysis
Total Claims: 0
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US3418180A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |