Trimming method for resistance value of polycrystalline silicon resistors especially used as semiconductor integrated circuit resistors
CA 1087261 A · Owner: Nippon Telegraph And Telephone Public Corporation · Inventors: Kato, Kotaro; Amemiya, Yoshihito
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Current having a density higher than a critical value is passed through a polycrystalline resistor doped with impurities at a concentration higher than a critical value to decreasingly correct the initial value of the resistance, thereby trimming the resistance value of the resistor. When the resistor is used in a semiconductor integrated curcuit, the current is passed through the existing (not additional) terminals of the integrated circuit.
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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 October 7, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 7, 1997.
- 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
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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.