Thermocouple vacuum gauge
CA 1255115 A · Owner: Varian, Inc. · Inventors: Zettler, John F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
10-, Abstract of the Disclosure, Thermocouple Vacuum Gauge A thermocouple pressure gauging system for measuring partial vacuum is provided which uses time multiplexing to alternately heat the thermocouple to constant temperature and then measure the EMF from thermocouple with heating current off. A signal proportional to pressure is derived from the heating duty cycle. The pressure signal is in turn used to derive a reference signal which is compared to the EMF from the thermocouple to control the heating of the thermocouple.
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 June 6, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 6, 2006.
- 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.