Semiconductor device
CA 2005618 A1 · Owner: Shiga, Nobuo · Inventors: Shiga, Nobuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a high impedance type light receiver circuit comprising a light receiving device, an amplifier circuit for amplifying an output of the light receiving device and an equalizer for band compensation a, capacitor of the equalizer is formed by the same PN junction structure as that of the light receiving device, and the light receiving device the amplifier, circuit and the equalizer are integrated on one semiconductor substrate so that adjustment of a time constant of the equalizer is not necessary. In this manner, the productivity if the high impedance type light receiver circuit which can attain a higher sensitivity than a trans-impedance type circuit is improved.
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
- Filed December 15, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 15, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 15, 2011.
- 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.