Avalanche photodiode
CA 1237511 A · Owner: Fujitsu Limited · Inventors: Nakajima, Kazuo; Kaneda, Takao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semiconductor device for receiving light comprising: a first semiconductor layer having a first conductivity type; a second semiconductor layer contact-, ing the first semiconductor layer having a forbidden, bandwidth larger than that of the first semiconductor layer and distributed so that the forbidden bandwidth has a maximum value at an intermediate position of the thickness direction and having a first conductivity type; and a third semiconductor region contacting the, second semiconductor layers having a forbidden bandwidth, smaller than that of the contact end portion between the semiconductor region and the second semiconductor layer and larger than that of the first semiconductor …
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 May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- 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.