US3209428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating semiconductor devices
Assignee: Westinghouse Electric Corp
•
Filing: 1961-07-20
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Granted: 1965-10-05
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Expires: 1981-07-20
Abstract
No abstract record available.
Inventors
- 👤 Ernest P Barbaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:10
CPC Classifications
H; H10; H10P; H10P52/00; H10D; H10D99/00; Y; Y10; Y10S; Y10S438/00; Y10S438/904; Y10S438/964
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD OF PRODUCING A SEMICONDUCTOR SWITCH DEVICE COMPRISING THE STEPS OF; FORMING A SEMICONDUCTOR STRUCTURE INCLUDING FOUR SUCCESSIVE REGIONS OF SEMICONDUCTIVE MATERIAL OF ALTERNATE SEMICONDUCTIVITY TYPE, SAID FOUR REGIONS INCLUDING AN EMITTER REGION AND A BASE REGION ADJACENT TO SAID EMITTER REGION; FORMINGAN OHMIC CONTACT ON SAID BASE REGION; TREATING THE SURFACE OF SAID BASE
Claim 2
Independent Claim
56 words
A METHOD OF PRODUCING A SEMICONDUCTOR SWITCH DEVICE COMPRISING THE STEPS OF; FORMING A SEMICONDUCTOR STRUCTURE INCLUDING FOUR SUCCESSIVE REGIONS OF SEMICONDUCTIVE MATERIAL OF ALTERNATE SEMICONDUCTIVITY TYPE, SAID FOUR REGIONS INCLUDING AN EMITTER REGION AND A BASE REGION ADJACENT TO SAID EMITTER REGION; FORMINGAN OHMIC CONTACT ON SAID BASE REGION; TREATING THE SURFACE OF SAID BASE
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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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |