← Back to Patent Explorer
US3658585A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of precipitating layers of semiconducting or insulating material from a flowing reaction gas or from a flowing dopant gas upon heated semiconductor crystals

Assignee: Siemens AG
•
Filing: 1970-02-26
•
Granted: 1972-04-25
•
Expires: 1990-02-26
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Method of precipitating layers of semiconducting or insulating material from a flowing reaction gas, upon heated semiconductor crystals, or for doping such crystals from a flowing dopant gas, wherein totally constant or only gradually changing operational conditions are maintained. The method is characterized by the fact that all working phases are so carried out with constant operational conditions. During one-half of the time required therefor, the reaction gas is transported approximately tangentially from one side over the semiconductor crystals to be processed. During the other half of the required period the reaction gas is transported approximately tangentially from the opposite side over the semiconductor crystals to be processed.

Inventors

  • 👤 Eduard Folkmann
  • 👤 Erich Pammer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 03:22
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/44; C23C16/455; C23C16/45502; C23C16/45561; C30; C30B; C30B25/00; C30B25/02; C30B25/14; H; H10; H10P; H10P95/00; Y; Y10; Y10S; Y10S118/00; Y10S118/90; Y10S438/00; Y10S438/935

Claims Analysis

Total Claims: 1
Claim 1
Independent Claim 27 words
The method as claimed in claim 1, wherein during the individual phases of the constant operational conditions, the process is being effected with repeatedly changing flow direction.

References Cited (Backward Citations)

US3293074A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-04-25 1975-10-25 1976-04-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-04-25 1979-10-25 1980-04-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-04-25 1983-10-25 1984-04-25 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag