Automatic level control circuit
CA 1186737 A · Owner: Sperry Corporation · Inventors: Fedde, George A.; Gottschalk, Juan M.; Kirk, Kenneth H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An automatic level control (ALC) circuit for use with a light beam scanning apparatus which apparatus is used to inspect printed circuit boards is disclosed. The printed circuit board contains a pattern of conducting surfaces on an insulating substrate. Light interaction with the conductors causes a detector assembly portion of the scanning apparatus to produce a first set of signals called conductor signals while light interaction with the substrate causes the detector assembly to produce a second set of signals called substrate signals. A first corrected reference signal corresponding to the conductor signals is generated during an initial adjustment period and is provided to summing …
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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
- Granted May 7, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 7, 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.