Telephone apparatus
CA 1201232 A · Owner: Sherman, Henry · Inventors: Sherman, Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Telephone apparatus comprising a line make switch and a handset including a microphone and an earphone for connection to a telephone network when the line switch is made, and a further apparatus for use in conjunction with the handset. The latter bears a first connector including electrical contacts connected with electrical components in the handset, the first connector providing electrical interconnections within the handset when the latter is used alone and providing selective interruptions in the interconnections and connection to further apparatus when mated with a second connector borne by the further apparatus.
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 February 25, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 25, 2003.
- 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.