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Expired Canadian patentCanada

User interface with multiple workspaces for sharing display system objects

CA 1301355 C · Owner: Card, Stuart K. · Inventors: Card, Stuart K.; Henderson, D. Austin, Jr.; Maxwell, John T. Iii

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Workspaces provided by an object-based user interface appear to share windows and other display objects. Each workspace's data structure includes, for each window in that workspace a linking data structure called, a placement which links to the display system object which provides that window, which may be a display system object in a preexisting window system. The placement also contains display characteristics of the window when displayed in that workspace, such as position and size. Therefore a, display system object can be linked to several workspaces by a placement in each of the workspaces' data structures and the window it provides to, each of those workspaces can have unique display …

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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 19, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 19, 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.
FiledFebruary 12, 1988
GrantedMay 19, 1992
Term endedMay 19, 2009
Patent numberCA 1301355 C
Classification (IPC)G06F3/14 +1 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedFeb 12, 1988Patent grantedMay 19, 1992Term endedMay 19, 2009

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.