Automatic cab signal test set
CA 1189179 A · Owner: American Standard Inc. · Inventors: Pierro, Joseph J. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An automatic electronic cab signal test set for testing the integrity of a pair of pickup coils and for checking the sensitivity of the amplifier of the cab signal receiver. A mode selector is connected to a clock oscillator which produces clock pulses. The clock pulses are connected to an up/down binary counter which sequentially counts up from zero to a maximum count and then sequentially counts down from the maximum count to zero. The up/down binary counter is connected to a code selector which changes the time constant of an R-C network of a code oscillator. The code oscillator illuminates an indication when the cab signal receiver is under test and modulates the carrier signal of a …
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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 June 18, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 18, 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.