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US3767485A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for producing improved pn junction

Assignee: Individual
•
Filing: 1971-12-29
•
Granted: 1973-10-23
•
Expires: 1991-12-29
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Abstract

Abstract A novel method for producing improved PN junctions of the diffusion type, having wide applicability in the field of semiconductor devices. PN junctions produced by the method of this invention possess superior characteristics, including reduced leakage, higher breakdown voltage and reduced surface inversion effects. The present invention substantially reduces the level of contaminants which, heretofore, were typically trapped in the vicinity of PN diffusion junctions, adversely affecting the quality of the junctions. In this novel method, diffusion of the junction and oxidation of the surface take place concurrently in a single heating step which takes place after the step of cutting or etching mesas in the semiconductor structure.

Inventors

  • 👤 A Sahagun

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 06:13
CPC Classifications
H; H10; H10P; H10P32/00; H10P32/10; H10P32/14; H10P32/1408; H10P32/141; H10D; H10D99/00; H10P32/1404; H10P32/17; H10P32/171; Y; Y10; Y10S; Y10S148/00; Y10S148/051; Y10S148/117; Y10S148/145; Y10S438/00; Y10S438/914; Y10S438/92

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

US2975080A Cited
US3346428A Cited
US3573115A Cited
US3592705A Cited
US3669768A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-10-22 1977-04-23 1977-10-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-10-22 1981-04-23 1981-10-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-10-22 1985-04-23 1985-10-23 $7700.00 Window Closed / Lapsed

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