Telephone index
CA 1307181 C · Owner: Confon Ag · Inventors: Halm, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The telephone index has a plurality of selection keys and a spring-operated drawer with a stack of index cards which is, held in the index housing by means of a locking device in such a way that on operating a selection key the drawer locking means is released and consequently the drawer with the selected index card and the index cards below it is extended whilst, the index cards located above the selected card are held back in the index housing by means of a card hold-back device released by the operated selection key and is constructed in such a way that the unlocking of the drawer on operating a selection key takes place by a drawer position change in such a way that in its front region …
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 September 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 2009.
- 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.