Typewriter ribbon having a thin support and a transferable mass, for typing on varied surfaces
CA 1268669 C · Owner: Rutz, Wolfhard · Inventors: Kunkel, Ernst; Rutz, Wolfhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a typewriter ribbon made up of a flexible thin support and a transferable mass placed on the flexible thin support. The transferable mass comprises a surfaceactive dispersing agent and a surface-active resin dissolved in a medium-boiling solvent. This ribbon is useful for correctable typing on delicate or treated paper, e.g. photocopied paper. 216/rc/sjh
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 May 8, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 8, 2007.
- 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.