Low-noise preamplifier
CA 1135804 A · Owner: Warner-Lambert Company · Inventors: Naylor, Thomas K.; Cavigelli, George A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention consists of a preamplifier for small signals generated in an inductive playback head by relative motion between the playback head and a magnetic recording medium having the signals recorded thereon. It comprises amplifying means having an input and an output means for extending the small, signal from the playback head to the amplifying means input and feedback means, connected from the output to the input of the amplifying means. This provides negative feedback of a portion of the signal applied to the input. The feedback means is operative to provide at the amplifying means output the integral of the signal within the playback head.
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 November 16, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 16, 1999.
- 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.