Tension Envelope Corporation v. JBM Envelope Company

GRUENDER, Circuit Judge.

Tension Envelope Corporation sued a former supplier, JBM Corporation, for selling directly, to its customers after promising not to do so. The district court 1 rejected one claim on the pleadings and the others on summary judgment. We affirm the district court’s rulings.

I

Tension and JBM manufacture and sell envelopes. In late 2000 or 2001, Tension began buying from JBM a special type of envelope—small, open-end envelopes 2 —to resell to customers. Three of Tension’s customers accounted for a significant percentage of the sales.

According to Tension, JBM offered…