Noise canceling photodetector preamplifier useful for computerized tomography
CA 2042277 A1 · Owner: Ribner, David B. · Inventors: Ribner, David B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A preamplifier interfaces low level current-mode signals, such as from a photodetector in a computerized tomography system, to corresponding voltage-mode signals with a dynamic range on the order of 120 dB. The preamplifier can be implemented in CMOS technology to allow for complete integration of the computerized tomography interface function, including analog-to-digital conversion of several channels in a single integrated circuit. The CMOS circuit accepts a current signal at its input and after, integration of the signal, produces a voltage output wherein the low frequency noise that is normally encountered with MOS transistors is cancelled through the use of correlated-double sampling. …
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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 May 9, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2013.
- 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.