Heterojunction bipolar transistors
CA 1286800 C · Owner: International Business Machines Corporation · Inventors: Jambotkar, Chakrapani G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Heterojunction bipolar transistor technology employing in a body wherein a larger area base electrode over a buried electrode has above it a smaller area electrode an overhang capability on the portion of the smaller area electrode that operates to mask the base layer in converting the extrinsic portion to high conductivity and assists lift-off of base contact metal such that the base contact metal is in extremely close proximity to the smaller area electrode.
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 July 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 23, 2008.
- 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.