In re Mixon

Worley, Chief Judge.

This appeal is from the decision of the Board of Appeals affirming *1397tlie examiner’s rejection under 35 USC 103 of claim 3 1 as obvious to one of ordinary skill in the art in view of patents to Hedler2 and Matthysse.3

Plug-insert type wire connectors have long been known, particularly in the electrical utility field. These plug-inserts may take the form of parallel-sided plugs or more often wedges which are driven into corresponding connector housings containing one or more conductors. Use of such connectors soon revealed that when subjected to temperature variation,…