Semi-automatic centering control
CA 1079671 A · Owner: International Business Machines Corporation · Inventors: Abell, William A. (Jr.)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure Disclosed is a control mechanism and device for conditioning a typewriter to backspace on every other depression of a keylever and at the same time to prevent printing on all depressions of keylevers. Additionally the typewriter, is conditioned to not print on those cycles in which a backspace movement is not included. This control mechanism and system allows the typist to key headings and other materials which would normally be centered in a no print mode and upon the completion of keying the entry once and switching into a normal typing mode the, typewriter is properly positioned with respect to the page for immediate rekeying of the heading or entry to provide …
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 June 17, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 17, 1997.
- 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.