Modem
CA 2114142 C · Owner: Heep, Jerry Joseph · Inventors: Heep, Jerry Joseph; Mosher, Stephen S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for effecting mode switching from a transmission mode to a command mode of an intelligent modem operatively coupled to a digital data device and a telephone line is disclosed. A termination of the modem's transmission mode (400) is effected after a predetermined silent time interval (406) in which no data is received from the device and prior to the transmission of additional data on the line. Operation of the modem switches to a buffer mode (410) in which data sent from the device is temporarily stored instead of being transmitted on the telephone line. If the stored data is a proper escape sequence (424) operation of the modem switches to the command mode. If a proper …
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 June 30, 1992 and granted November 10, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 30, 2014.
- 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.