tolling agreement

Short definition from Wiktionary

Noun

1. 1
   An agreement by a toller with an owner of raw materials to process the raw material for a specified fee ("toll") into a product with the raw material and the product remaining the property of the provider of the raw material. E.g. converting fuel into electricity at a certain price.
2. 2
   An agreement to deliver a specified amount of raw material per period through a particular processing facility.
3. 3
   An agreement that has the effect of tolling or suspending the course of a fixed period of time, as a statute of limitations.