Power supply for vacuum fluorescent displays
CA 2148207 C · Owner: Rothfuss, Daniel C. · Inventors: Lameris, Gary J.; Rothfuss, Daniel C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A power supply for a large or dual vacuum fluorescent display having a DC source coupled to a switching regulator to generate a stepped up DC voltage. A -5 volt regulator is coupled to the switching regulator output, to provide a second DC voltage. A grid and segment driver is supplied with the regulator output. The driver is coupled to a microprocessor and, selectively drives the grid and plate segments to display data from the microprocessor. An oscillator circuit is also coupled to the DC source to generate an AC signal. The AC signal is coupled to an inverter to generate a second phase-shifted AC signal. The AC signals are provided to a pair of output drivers which amplify and output …
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
- Filed April 28, 1995 and granted July 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 28, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 2017.
- 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.