US3473980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Significant impurity sources for solid state diffusion
Assignee: AT&T Inc
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Filing: 1966-10-11
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Granted: 1969-10-21
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Expires: 1986-10-11
Abstract
No abstract record available.
Inventors
- 👤 William E Beadle
- 👤 Kenneth E Benson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:17
CPC Classifications
C; C30; C30B; C30B31/00; C30B31/06; C30B31/16; C30B31/165; H; H10; H10P; H10P32/00; H10P32/10; H10P32/19; Y; Y10; Y10S; Y10S148/00; Y10S148/04; Y10S148/041; Y10S148/059; Y10S252/00; Y10S252/95; Y10S252/951
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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |