Patent Yard Sign in
Expired Canadian patentCanada

Amorphous silicon semiconductor film and production process thereof

CA 1255194 A · Owner: Toa Nenryo Kogyo K.K. · Inventors: Yoshida, Toshihiko; Okayasu, Yoshinobu; Asai, Kunio

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

Open the CIPO record

Abstract From the Canadian patent

This invention disclose an amorphous silicon semiconductor film containing at least hydrogen carbon and, oxygen as impurities and the method to produce it. The film is characterized in that the total quantity of carbon and oxygen in said film is at least 0.1 atom %. Since the film has small light absorption coefficient and its optical refractive index is controllable an excellent, window material for solar cell can be provided. As an adherence of the film with metal electrode as well as with transparent electrode is sufficient, the good reproducibility in making solar cell using the film of this invention as window material was realized.

Read the whole patent

Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Granted June 6, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 6, 2006.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 12, 1984
GrantedJune 6, 1989
Term endedJune 6, 2006
Patent numberCA 1255194 A
Classification (IPC)H01L31/20 +2 more

Timeline

Timeline From CIPO dates

19851988199119941997200020032006Application filedOct 12, 1984Patent grantedJune 6, 1989Term endedJune 6, 2006

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.