Process for tapering openings in glass coatings
CA 1189426 A · Owner: Rca Corporation · Inventors: Hsu, Sheng T.; Flatley, Doris W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for defining improved tapered openings in glass coatings comprises forming passivating layers of a doped silicon oxide having a relatively low given flow temperature, the layers being formed over the surface of a semiconductor body. After forming contact openings in the doped oxide layer, the layer is heated to a temperature lower than the given flow temperature for a period of time sufficient only to soften and recontour the edges of the contact opening, the lower temperature being insufficient to form a significant oxide growth on the surface of the semiconductor body.
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 25, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 25, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.